Intervention Pact (Card)
Intervention Pact
In 3120 decks
0.11% of 2971256 decks
May 9, 2025
The Best Free White Spells for Commander
Everyone loves free stuff. So let's take a look at the best white spells in Magic that you can cast for free in Commander.
May 5, 2020
Rolebuilding - Divergent Experiments
What's better than one Knowledge Pool? A POOL of Knowledge Pools!
Stiltzkin, Moogle Merchant
5.08% of 984 decks
50 decks
Top Commanders
Kenrith, the Returned King
0.90% of 25512 decks
229 decks
Queen Marchesa
0.83% of 14306 decks
119 decks
Oloro, Ageless Ascetic
0.55% of 15185 decks
84 decks
Selenia, Dark Angel
10.35% of 792 decks
82 decks
Zedruu the Greathearted
0.63% of 8946 decks
56 decks
Kydele, Chosen of Kruphix // Tymna the Weaver
6.84% of 731 decks
50 decks
Garth One-Eye
1.10% of 4455 decks
49 decks
The Twelfth Doctor // Romana II
20.80% of 226 decks
47 decks
Kynaios and Tiro of Meletis
0.48% of 9517 decks
46 decks
Giada, Font of Hope
0.19% of 23801 decks
45 decks
Liesa, Shroud of Dusk
0.37% of 10254 decks
38 decks
Firesong and Sunspeaker
0.95% of 3887 decks
37 decks
Lotho, Corrupt Shirriff
2.44% of 1433 decks
35 decks
Bilbo, Birthday Celebrant
0.57% of 6090 decks
35 decks
Jodah, Archmage Eternal
0.42% of 8258 decks
35 decks
Codie, Vociferous Codex
0.54% of 6334 decks
34 decks
Treebeard, Gracious Host
1.55% of 2123 decks
33 decks
Esika, God of the Tree
0.16% of 20343 decks
33 decks
Piru, the Volatile
1.73% of 1730 decks
30 decks
New Cards
The Wind Crystal
12% of 536 decks
+12% synergy
The Water Crystal
8% of 259 decks
+8% synergy
Gongaga, Reactor Town
6% of 110 decks
+6% synergy
Space-Time Anomaly
6% of 48 decks
+6% synergy
Restoration Magic
6% of 489 decks
+6% synergy
High Synergy Cards
Pact of Negation
56% of 1606 decks
+56% synergy
Swords to Plowshares
48% of 3120 decks
+48% synergy
Summoner's Pact
48% of 1160 decks
+48% synergy
Pact of the Titan
45% of 1544 decks
+45% synergy
Slaughter Pact
42% of 1836 decks
+42% synergy
Farseek
40% of 1160 decks
+40% synergy
Birds of Paradise
37% of 1160 decks
+37% synergy
Path to Exile
37% of 3120 decks
+37% synergy
Hive Mind
36% of 1606 decks
+36% synergy
Reliquary Tower
34% of 3120 decks
+34% synergy
Top Cards
Nature's Lore
32% of 1160 decks
+32% synergy
Angel's Grace
32% of 3120 decks
+32% synergy
Door to Nothingness
30% of 674 decks
+30% synergy
Alchemist's Gambit
29% of 1032 decks
+29% synergy
Three Visits
29% of 1160 decks
+29% synergy
Lich's Mastery
28% of 1836 decks
+28% synergy
Glorious End
27% of 1544 decks
+27% synergy
Anguished Unmaking
27% of 1836 decks
+27% synergy
Heroic Intervention
27% of 1160 decks
+27% synergy
Chance for Glory
27% of 1544 decks
+27% synergy
Game Changers
Demonic Tutor
34% of 1836 decks
+34% synergy
Teferi's Protection
31% of 3120 decks
+31% synergy
Enlightened Tutor
30% of 3120 decks
+29% synergy
Vampiric Tutor
29% of 1836 decks
+29% synergy
Smothering Tithe
25% of 3120 decks
+25% synergy
Rhystic Study
25% of 1606 decks
+25% synergy
Mystical Tutor
21% of 1606 decks
+21% synergy
Bolas's Citadel
17% of 1836 decks
+17% synergy
Cyclonic Rift
16% of 1606 decks
+16% synergy
Worldly Tutor
15% of 1160 decks
+15% synergy
Creatures
Esper Sentinel
21% of 3120 decks
+21% synergy
Bloom Tender
21% of 1160 decks
+20% synergy
Platinum Angel
20% of 3120 decks
+20% synergy
Eternal Witness
19% of 1160 decks
+19% synergy
Kambal, Consul of Allocation
19% of 1836 decks
+19% synergy
Zedruu the Greathearted
18% of 1032 decks
+18% synergy
Soul Warden
18% of 3120 decks
+18% synergy
Vito, Thorn of the Dusk Rose
16% of 1836 decks
+16% synergy
Phage the Untouchable
16% of 1836 decks
+16% synergy
Sakura-Tribe Elder
16% of 1160 decks
+15% synergy
Soul's Attendant
15% of 3120 decks
+15% synergy
Vizkopa Guildmage
14% of 1836 decks
+14% synergy
Archfiend of the Dross
14% of 1836 decks
+14% synergy
Brash Taunter
14% of 1544 decks
+13% synergy
Abyssal Persecutor
14% of 1836 decks
+13% synergy
Children of Korlis
13% of 3120 decks
+13% synergy
Cloudsteel Kirin
13% of 3120 decks
+12% synergy
Exquisite Archangel
13% of 3120 decks
+12% synergy
Grand Abolisher
12% of 3120 decks
+12% synergy
Noble Hierarch
12% of 877 decks
+12% synergy
Enduring Angel
11% of 3120 decks
+11% synergy
Faeburrow Elder
11% of 1160 decks
+11% synergy
Lotho, Corrupt Shirriff
11% of 1836 decks
+11% synergy
Avacyn's Pilgrim
11% of 1160 decks
+10% synergy
Serra Ascendant
11% of 3120 decks
+10% synergy
Gisela, Blade of Goldnight
11% of 1544 decks
+10% synergy
Felidar Sovereign
11% of 3120 decks
+10% synergy
Dryad of the Ilysian Grove
10% of 1160 decks
+10% synergy
Essence Warden
10% of 1160 decks
+10% synergy
Ignoble Hierarch
10% of 690 decks
+10% synergy
Zur the Enchanter
10% of 1073 decks
+10% synergy
Llanowar Elves
10% of 1160 decks
+10% synergy
Gray Merchant of Asphodel
10% of 1836 decks
+10% synergy
Tree of Perdition
10% of 1836 decks
+9% synergy
Enduring Tenacity
9% of 1360 decks
+9% synergy
Rhox Faithmender
9% of 3120 decks
+9% synergy
Mangara, the Diplomat
9% of 3120 decks
+9% synergy
Archivist of Oghma
9% of 3120 decks
+9% synergy
Herald of Eternal Dawn
9% of 1767 decks
+8% synergy
Laboratory Maniac
8% of 1606 decks
+8% synergy
Sanctum Weaver
8% of 1160 decks
+8% synergy
Windborn Muse
8% of 3120 decks
+8% synergy
Solemn Simulacrum
8% of 3120 decks
+8% synergy
Humble Defector
8% of 1544 decks
+8% synergy
Loran of the Third Path
8% of 3120 decks
+8% synergy
Heliod, Sun-Crowned
7% of 3120 decks
+7% synergy
Delighted Halfling
7% of 1160 decks
+7% synergy
Weathered Wayfarer
7% of 3120 decks
+7% synergy
Bloodthirsty Conqueror
7% of 1027 decks
+7% synergy
Selfless Squire
7% of 3120 decks
+7% synergy
Instants
Counterspell
27% of 1606 decks
+26% synergy
Final Fortune
25% of 1544 decks
+24% synergy
Dark Ritual
24% of 1836 decks
+24% synergy
Stunning Reversal
24% of 1836 decks
+24% synergy
Deflecting Palm
21% of 1544 decks
+21% synergy
Brainstorm
18% of 1606 decks
+18% synergy
Boros Charm
18% of 1544 decks
+18% synergy
Generous Gift
17% of 3120 decks
+17% synergy
Chaos Warp
17% of 1544 decks
+17% synergy
Sudden Substitution
16% of 1606 decks
+16% synergy
Inkshield
15% of 1836 decks
+15% synergy
Arcane Denial
14% of 1606 decks
+14% synergy
An Offer You Can't Refuse
14% of 1606 decks
+14% synergy
Deflecting Swat
14% of 1544 decks
+14% synergy
Everybody Lives!
14% of 2944 decks
+14% synergy
Dovin's Veto
13% of 1606 decks
+13% synergy
Mana Drain
13% of 1606 decks
+13% synergy
Delirium
13% of 992 decks
+13% synergy
Rakdos Charm
13% of 992 decks
+13% synergy
Swan Song
13% of 1606 decks
+13% synergy
Fierce Guardianship
12% of 1606 decks
+12% synergy
Ad Nauseam
12% of 1836 decks
+12% synergy
Force of Will
10% of 1606 decks
+10% synergy
Silence
10% of 3120 decks
+10% synergy
Stifle
10% of 1606 decks
+10% synergy
Flare of Fortitude
10% of 2377 decks
+10% synergy
Despark
10% of 1836 decks
+9% synergy
Arcbond
10% of 1544 decks
+9% synergy
Beast Within
9% of 1160 decks
+9% synergy
Comeuppance
9% of 3120 decks
+9% synergy
Negate
9% of 1606 decks
+9% synergy
Tale's End
9% of 1606 decks
+9% synergy
Beacon of Immortality
9% of 3120 decks
+9% synergy
Take the Bait
9% of 1308 decks
+8% synergy
Trickbind
9% of 1606 decks
+8% synergy
Heliod's Intervention
8% of 3120 decks
+8% synergy
Reprieve
8% of 3120 decks
+8% synergy
Assassin's Trophy
8% of 853 decks
+8% synergy
Valakut Awakening
8% of 1544 decks
+8% synergy
Flawless Maneuver
8% of 3120 decks
+8% synergy
Force of Negation
8% of 1606 decks
+8% synergy
Release to the Wind
8% of 1606 decks
+8% synergy
Void Rend
8% of 1073 decks
+8% synergy
Riot Control
8% of 3120 decks
+7% synergy
Stroke of Midnight
7% of 3067 decks
+7% synergy
Dawn Charm
7% of 3120 decks
+7% synergy
Dawn's Truce
7% of 2234 decks
+7% synergy
Frantic Search
7% of 1606 decks
+7% synergy
Untimely Malfunction
7% of 995 decks
+7% synergy
Tibalt's Trickery
7% of 1544 decks
+7% synergy
Sorceries
Last Chance
24% of 1544 decks
+24% synergy
Cultivate
23% of 1160 decks
+23% synergy
Warrior's Oath
23% of 1544 decks
+23% synergy
Blasphemous Act
22% of 1544 decks
+22% synergy
Fractured Identity
21% of 1606 decks
+21% synergy
Harmless Offering
17% of 1544 decks
+17% synergy
Toxic Deluge
17% of 1836 decks
+17% synergy
Skyshroud Claim
16% of 1160 decks
+16% synergy
Rampant Growth
16% of 1160 decks
+15% synergy
Kodama's Reach
15% of 1160 decks
+15% synergy
Idyllic Tutor
14% of 3120 decks
+14% synergy
Damn
14% of 1836 decks
+14% synergy
Donate
14% of 1606 decks
+14% synergy
Farewell
13% of 3120 decks
+13% synergy
Approach of the Second Sun
12% of 3120 decks
+12% synergy
Repay in Kind
11% of 1836 decks
+11% synergy
Exsanguinate
11% of 1836 decks
+11% synergy
Windfall
11% of 1606 decks
+11% synergy
Jeska's Will
10% of 1544 decks
+10% synergy
Grim Tutor
10% of 1836 decks
+10% synergy
Tempt with Discovery
10% of 1160 decks
+10% synergy
Supreme Verdict
10% of 1606 decks
+10% synergy
Reanimate
9% of 1836 decks
+9% synergy
Imperial Seal
9% of 1836 decks
+9% synergy
Wheel of Misfortune
9% of 1544 decks
+9% synergy
Diabolic Tutor
9% of 1836 decks
+9% synergy
Ruinous Ultimatum
9% of 992 decks
+8% synergy
Faithless Looting
8% of 1544 decks
+8% synergy
Night's Whisper
8% of 1836 decks
+8% synergy
Fumigate
8% of 3120 decks
+8% synergy
Sign in Blood
8% of 1836 decks
+8% synergy
Profane Tutor
8% of 1836 decks
+8% synergy
Ponder
8% of 1606 decks
+8% synergy
Austere Command
8% of 3120 decks
+8% synergy
Debt to the Deathless
8% of 1836 decks
+7% synergy
Gamble
7% of 1544 decks
+7% synergy
Diabolic Intent
7% of 1836 decks
+7% synergy
Scheming Symmetry
7% of 1836 decks
+7% synergy
Taunt from the Rampart
7% of 1544 decks
+7% synergy
Peer into the Abyss
7% of 1836 decks
+7% synergy
Role Reversal
7% of 1032 decks
+7% synergy
Wrath of God
7% of 3120 decks
+6% synergy
Bala Ged Recovery
6% of 1160 decks
+6% synergy
Fabricate
6% of 1606 decks
+6% synergy
Disrupt Decorum
6% of 1544 decks
+6% synergy
Sickening Dreams
6% of 1836 decks
+6% synergy
Gitaxian Probe
6% of 1606 decks
+6% synergy
Read the Bones
6% of 1836 decks
+6% synergy
Profane Transfusion
6% of 1836 decks
+6% synergy
Preordain
5% of 1606 decks
+5% synergy
Utility Artifacts
Aetherflux Reservoir
17% of 3120 decks
+17% synergy
Marina Vendrell's Grimoire
17% of 1033 decks
+17% synergy
Tainted Sigil
17% of 1836 decks
+16% synergy
Lightning Greaves
14% of 3120 decks
+14% synergy
Swiftfoot Boots
14% of 3120 decks
+13% synergy
Immortal Coil
13% of 1836 decks
+13% synergy
The Book of Exalted Deeds
12% of 3120 decks
+12% synergy
Sunforger
12% of 1544 decks
+12% synergy
The Golden Throne
11% of 3120 decks
+11% synergy
Alhammarret's Archive
10% of 3120 decks
+10% synergy
The One Ring
10% of 3120 decks
+10% synergy
Well of Lost Dreams
9% of 3120 decks
+9% synergy
Wishclaw Talisman
9% of 1836 decks
+9% synergy
Pact Weapon
8% of 1836 decks
+8% synergy
Pearl Medallion
8% of 3120 decks
+8% synergy
Sensei's Divining Top
7% of 3120 decks
+7% synergy
Wayfarer's Bauble
7% of 3120 decks
+7% synergy
Lich's Mirror
6% of 3120 decks
+6% synergy
Cosmos Elixir
6% of 3120 decks
+6% synergy
The Deck of Many Things
6% of 3120 decks
+5% synergy
Archaeomancer's Map
5% of 3120 decks
+5% synergy
Wedding Ring
5% of 3120 decks
+5% synergy
Sundial of the Infinite
5% of 3120 decks
+5% synergy
Mishra's Bauble
5% of 3120 decks
+5% synergy
Skullclamp
5% of 3120 decks
+5% synergy
Enchantments
Ghostly Prison
23% of 3120 decks
+23% synergy
Propaganda
21% of 1606 decks
+21% synergy
Demonic Pact
19% of 1836 decks
+19% synergy
Nefarious Lich
18% of 1836 decks
+17% synergy
Mystic Remora
17% of 1606 decks
+17% synergy
Authority of the Consuls
17% of 3120 decks
+17% synergy
Nine Lives
17% of 3120 decks
+17% synergy
Lich
16% of 1836 decks
+16% synergy
Phyrexian Arena
16% of 1836 decks
+16% synergy
Sanguine Bond
16% of 1836 decks
+16% synergy
Leyline of the Guildpact
15% of 596 decks
+15% synergy
Sterling Grove
14% of 1160 decks
+14% synergy
Land Tax
14% of 3120 decks
+14% synergy
Phyrexian Unlife
13% of 3120 decks
+13% synergy
Black Market Connections
13% of 1836 decks
+13% synergy
Exquisite Blood
13% of 1836 decks
+13% synergy
Necropotence
13% of 1836 decks
+13% synergy
Leyline of Anticipation
13% of 1606 decks
+13% synergy
Transcendence
12% of 3120 decks
+12% synergy
Forbidden Crypt
11% of 1836 decks
+11% synergy
Out of the Tombs
11% of 1836 decks
+11% synergy
Blind Obedience
11% of 3120 decks
+11% synergy
Triskaidekaphobia
11% of 1836 decks
+11% synergy
Sylvan Library
10% of 1160 decks
+10% synergy
Solitary Confinement
9% of 3120 decks
+9% synergy
Trouble in Pairs
9% of 2677 decks
+9% synergy
Solemnity
9% of 3120 decks
+8% synergy
Cleric Class
9% of 3120 decks
+8% synergy
Delaying Shield
8% of 3120 decks
+8% synergy
Test of Endurance
7% of 3120 decks
+7% synergy
Rites of Flourishing
7% of 1160 decks
+7% synergy
Wild Growth
7% of 1160 decks
+7% synergy
The Meathook Massacre
7% of 1836 decks
+6% synergy
Near-Death Experience
7% of 3120 decks
+6% synergy
Mirari's Wake
6% of 1160 decks
+6% synergy
Axis of Mortality
6% of 3120 decks
+6% synergy
Sphere of Safety
6% of 3120 decks
+6% synergy
Curse of Opulence
6% of 1544 decks
+6% synergy
Animate Dead
6% of 1836 decks
+6% synergy
Exploration
6% of 1160 decks
+6% synergy
Boon Reflection
6% of 3120 decks
+6% synergy
Leyline of Mutation
6% of 445 decks
+6% synergy
Greed
6% of 1836 decks
+5% synergy
Puca's Mischief
5% of 1606 decks
+5% synergy
Omniscience
5% of 1606 decks
+5% synergy
Darksteel Mutation
5% of 3120 decks
+5% synergy
Grasp of Fate
5% of 3120 decks
+5% synergy
Smuggler's Share
5% of 3120 decks
+5% synergy
Words of Worship
5% of 3120 decks
+5% synergy
Burgeoning
5% of 1160 decks
+5% synergy
Planeswalkers
Gideon of the Trials
11% of 3120 decks
+11% synergy
Jace, Wielder of Mysteries
5% of 1606 decks
+5% synergy
Utility Lands
Boseiju, Who Endures
19% of 1160 decks
+19% synergy
Otawara, Soaring City
16% of 1606 decks
+16% synergy
Bojuka Bog
16% of 1836 decks
+16% synergy
Urborg, Tomb of Yawgmoth
13% of 3120 decks
+13% synergy
Hall of Heliod's Generosity
12% of 3120 decks
+12% synergy
Ancient Tomb
12% of 3120 decks
+12% synergy
Vault of the Archangel
11% of 1836 decks
+11% synergy
Rogue's Passage
11% of 3120 decks
+11% synergy
Maze of Ith
11% of 3120 decks
+10% synergy
Cabal Coffers
10% of 1836 decks
+10% synergy
Eiganjo, Seat of the Empire
9% of 3120 decks
+9% synergy
Temple of the False God
8% of 3120 decks
+8% synergy
Urza's Saga
7% of 3120 decks
+7% synergy
War Room
7% of 3120 decks
+6% synergy
Emeria, the Sky Ruin
6% of 3120 decks
+6% synergy
Mistrise Village
6% of 469 decks
+6% synergy
Kor Haven
6% of 3120 decks
+6% synergy
Nykthos, Shrine to Nyx
6% of 3120 decks
+6% synergy
Mutavault
6% of 3120 decks
+6% synergy
Mystic Sanctuary
5% of 1606 decks
+5% synergy
Takenuma, Abandoned Mire
5% of 1836 decks
+5% synergy
Mana Artifacts
Sol Ring
81% of 3120 decks
+80% synergy
Arcane Signet
68% of 3120 decks
+67% synergy
Fellwar Stone
27% of 3120 decks
+26% synergy
Talisman of Hierarchy
26% of 1836 decks
+26% synergy
Orzhov Signet
25% of 1836 decks
+25% synergy
Talisman of Conviction
22% of 1544 decks
+22% synergy
Boros Signet
20% of 1544 decks
+20% synergy
Chromatic Lantern
19% of 3120 decks
+19% synergy
Talisman of Progress
18% of 1606 decks
+18% synergy
Thought Vessel
18% of 3120 decks
+18% synergy
Azorius Signet
17% of 1606 decks
+17% synergy
Talisman of Indulgence
15% of 992 decks
+15% synergy
Talisman of Creativity
15% of 1032 decks
+15% synergy
Talisman of Dominance
13% of 1073 decks
+13% synergy
Izzet Signet
13% of 1032 decks
+13% synergy
Commander's Sphere
12% of 3120 decks
+12% synergy
Dimir Signet
11% of 1073 decks
+11% synergy
Lotus Petal
11% of 3120 decks
+11% synergy
Rakdos Signet
11% of 992 decks
+11% synergy
Mind Stone
10% of 3120 decks
+10% synergy
Chrome Mox
10% of 3120 decks
+10% synergy
Mana Vault
10% of 3120 decks
+10% synergy
Mox Amber
8% of 3120 decks
+7% synergy
Mox Opal
7% of 3120 decks
+7% synergy
Talisman of Unity
6% of 1160 decks
+6% synergy
Mox Diamond
6% of 3120 decks
+6% synergy
Timeless Lotus
6% of 674 decks
+6% synergy
Selesnya Signet
6% of 1160 decks
+6% synergy
Mana Crypt
6% of 3120 decks
+6% synergy
Golgari Signet
6% of 853 decks
+6% synergy
Pristine Talisman
5% of 3120 decks
+5% synergy
Talisman of Resilience
5% of 853 decks
+5% synergy
Lands
Command Tower
72% of 3120 decks
+72% synergy
Godless Shrine
51% of 1836 decks
+51% synergy
Hallowed Fountain
46% of 1606 decks
+46% synergy
Watery Grave
45% of 1073 decks
+45% synergy
Overgrown Tomb
43% of 853 decks
+43% synergy
Temple Garden
42% of 1160 decks
+42% synergy
Sacred Foundry
41% of 1544 decks
+41% synergy
Steam Vents
41% of 1032 decks
+41% synergy
Breeding Pool
40% of 877 decks
+40% synergy
Blood Crypt
40% of 992 decks
+40% synergy
Savai Triome
39% of 992 decks
+39% synergy
The World Tree
38% of 674 decks
+38% synergy
Stomping Ground
37% of 806 decks
+37% synergy
Indatha Triome
37% of 853 decks
+37% synergy
Raugrin Triome
36% of 1032 decks
+36% synergy
Exotic Orchard
35% of 3120 decks
+34% synergy
Spara's Headquarters
34% of 877 decks
+34% synergy
Zagoth Triome
33% of 759 decks
+33% synergy
Jetmir's Garden
33% of 806 decks
+32% synergy
Xander's Lounge
29% of 713 decks
+29% synergy
Caves of Koilos
29% of 1836 decks
+29% synergy
Vault of Champions
28% of 1836 decks
+28% synergy
Marsh Flats
27% of 3120 decks
+27% synergy
Sea of Clouds
26% of 1606 decks
+26% synergy
Raffine's Tower
26% of 1073 decks
+26% synergy
Isolated Chapel
25% of 1836 decks
+25% synergy
Arid Mesa
23% of 3120 decks
+23% synergy
Ketria Triome
23% of 731 decks
+23% synergy
Flooded Strand
22% of 3120 decks
+22% synergy
Spectator Seating
22% of 1544 decks
+22% synergy
Battlefield Forge
20% of 1544 decks
+20% synergy
Clifftop Retreat
20% of 1544 decks
+20% synergy
Glacial Fortress
20% of 1606 decks
+20% synergy
Scrubland
19% of 1836 decks
+19% synergy
Bayou
19% of 853 decks
+18% synergy
Bountiful Promenade
18% of 1160 decks
+18% synergy
Prairie Stream
18% of 1606 decks
+18% synergy
Underground Sea
18% of 1073 decks
+18% synergy
Morphic Pool
18% of 1073 decks
+18% synergy
Mystic Monastery
18% of 1032 decks
+18% synergy
Tropical Island
18% of 877 decks
+18% synergy
Arcane Sanctum
18% of 1073 decks
+18% synergy
Bloodstained Mire
17% of 3120 decks
+17% synergy
Training Center
17% of 1032 decks
+17% synergy
Tundra
17% of 1606 decks
+17% synergy
Fetid Heath
17% of 1836 decks
+17% synergy
Polluted Delta
17% of 3120 decks
+16% synergy
Windswept Heath
16% of 3120 decks
+16% synergy
Nomad Outpost
16% of 992 decks
+16% synergy
City of Brass
16% of 3120 decks
+16% synergy