Agatha's Soul Cauldron + Spike Feeder + Celestial Unicorn

Agatha's Soul Cauldron
Spike Feeder
Celestial Unicorn

Requires
Agatha's Soul Cauldron must be on the battlefield. Spike Feeder must be in exile (exiled by Agatha's Soul Cauldron). Celestial Unicorn must be on the battlefield. Celestial Unicorn has at least one +1/+1 counter on it.
Steps
  1. Activate Celestial Unicorn using Spike Feeder's second ability by removing a +1/+1 counter from it, causing you to gain 2 life.
  2. Celestial Unicorn triggers, putting a +1/+1 counter on it.
  3. Repeat.
Results
Infinite lifegain. Infinite lifegain triggers.

Lathiel, the Bounteous Dawn
0.17% of 4719 decks 8 decks
Shalai and Hallar
0.02% of 8949 decks 2 decks
Kenrith, the Returned King
0.00% of 21513 decks 1 decks
Trelasarra, Moon Dancer
0.04% of 2289 decks 1 decks
Atraxa, Praetors' Voice
0.00% of 35211 decks 1 decks
High Synergy Cards
Voice of the Blessed
69% of 13 decks +68% synergy
Archangel of Thune
69% of 13 decks +67% synergy
Heliod, Sun-Crowned
69% of 13 decks +66% synergy
Conclave Mentor
69% of 13 decks +65% synergy
Cleric Class
62% of 13 decks +59% synergy
Soul Warden
62% of 13 decks +56% synergy
Ajani's Pridemate
54% of 13 decks +53% synergy
Gavony Township
62% of 13 decks +52% synergy
The Ozolith
54% of 13 decks +50% synergy
Aetherflux Reservoir
54% of 13 decks +50% synergy
Top Cards
Hardened Scales
54% of 13 decks +45% synergy
Cultivate
54% of 13 decks +7% synergy
Trelasarra, Moon Dancer
46% of 13 decks +45% synergy
Rhox Faithmender
46% of 13 decks +45% synergy
Soul's Attendant
46% of 13 decks +43% synergy
Kami of Whispered Hopes
46% of 13 decks +39% synergy
Eladamri's Call
46% of 13 decks +35% synergy
Esper Sentinel
46% of 13 decks +25% synergy
Heroic Intervention
46% of 13 decks +17% synergy
Light of Promise
38% of 13 decks +37% synergy
Creatures
Envoy of the Ancestors
50% of 6 decks +48% synergy
Ocelot Pride
50% of 6 decks +44% synergy
Basking Broodscale
43% of 7 decks +40% synergy
Abzan Battle Priest
38% of 13 decks +37% synergy
Angel of Vitality
38% of 13 decks +37% synergy
Sunscorch Regent
38% of 13 decks +36% synergy
Walking Ballista
38% of 13 decks +36% synergy
Essence Warden
38% of 13 decks +36% synergy
Elenda's Hierophant
36% of 11 decks +33% synergy
Kutzil, Malamet Exemplar
36% of 11 decks +17% synergy
Ageless Entity
31% of 13 decks +31% synergy
Triskelion
31% of 13 decks +30% synergy
Accomplished Alchemist
31% of 13 decks +30% synergy
Felidar Sovereign
31% of 13 decks +29% synergy
Daxos, Blessed by the Sun
31% of 13 decks +28% synergy
Trostani, Selesnya's Voice
31% of 13 decks +28% synergy
Abzan Falconer
31% of 13 decks +28% synergy
Good-Fortune Unicorn
31% of 13 decks +28% synergy
Shalai, Voice of Plenty
31% of 13 decks +24% synergy
Gideon's Company
23% of 13 decks +23% synergy
Twinblade Paladin
23% of 13 decks +23% synergy
Loyal Unicorn
23% of 13 decks +22% synergy
Herd Baloth
23% of 13 decks +22% synergy
Lunarch Veteran
23% of 13 decks +22% synergy
Nykthos Paragon
23% of 13 decks +22% synergy
Scurry Oak
23% of 13 decks +21% synergy
Fertilid
23% of 13 decks +21% synergy
Hamza, Guardian of Arashin
23% of 13 decks +21% synergy
Gala Greeters
23% of 13 decks +20% synergy
Vorinclex, Monstrous Raider
23% of 13 decks +19% synergy
Kodama of the West Tree
23% of 13 decks +19% synergy
Champion of Lambholt
23% of 13 decks +16% synergy
Evolution Sage
23% of 13 decks +16% synergy
Birds of Paradise
23% of 13 decks -4% synergy
Instants
Inspiring Call
38% of 13 decks +31% synergy
Path to Exile
38% of 13 decks -7% synergy
Swords to Plowshares
38% of 13 decks -24% synergy
Enlightened Tutor
31% of 13 decks +13% synergy
Pulse of Murasa
23% of 13 decks +23% synergy
Heliod's Intervention
23% of 13 decks +20% synergy
Return to Nature
23% of 13 decks +17% synergy
Tamiyo's Safekeeping
23% of 13 decks +16% synergy
Worldly Tutor
23% of 13 decks +9% synergy
Teferi's Protection
23% of 13 decks +3% synergy
Sorceries
Damning Verdict
31% of 13 decks +29% synergy
Farseek
31% of 13 decks -3% synergy
Scale the Heights
23% of 13 decks +22% synergy
Fumigate
23% of 13 decks +20% synergy
Kodama's Reach
23% of 13 decks -9% synergy
Rampant Growth
23% of 13 decks -12% synergy
Utility Artifacts
Well of Lost Dreams
38% of 13 decks +37% synergy
Alhammarret's Archive
31% of 13 decks +29% synergy
The Great Henge
23% of 13 decks +13% synergy
Swiftfoot Boots
23% of 13 decks -5% synergy
Enchantments
Innkeeper's Talent
75% of 4 decks +66% synergy
Sunbond
31% of 13 decks +30% synergy
Authority of the Consuls
31% of 13 decks +27% synergy
Smothering Tithe
31% of 13 decks +6% synergy
Noble Purpose
23% of 13 decks +23% synergy
Boon Reflection
23% of 13 decks +22% synergy
Branching Evolution
23% of 13 decks +18% synergy
Sylvan Library
23% of 13 decks +11% synergy
Mirari's Wake
23% of 13 decks +9% synergy
Planeswalkers
Ajani, the Greathearted
38% of 13 decks +35% synergy
Ajani, Strength of the Pride
23% of 13 decks +22% synergy
Utility Lands
Karn's Bastion
38% of 13 decks +33% synergy
Rogue's Passage
38% of 13 decks +19% synergy
Radiant Fountain
31% of 13 decks +30% synergy
Boseiju, Who Endures
31% of 13 decks +11% synergy
Reliquary Tower
31% of 13 decks +1% synergy
Yavimaya, Cradle of Growth
23% of 13 decks +14% synergy
Mosswort Bridge
23% of 13 decks +13% synergy
Mana Artifacts
Sol Ring
69% of 13 decks -15% synergy
Arcane Signet
62% of 13 decks -10% synergy
Lands
Stomping Ground
100% of 3 decks +59% synergy
Command Tower
85% of 13 decks +11% synergy
Blossoming Sands
62% of 13 decks +55% synergy
Graypelt Refuge
46% of 13 decks +43% synergy
Brushland
46% of 13 decks +30% synergy
Canopy Vista
46% of 13 decks +10% synergy
Temple Garden
46% of 13 decks +6% synergy
Bountiful Promenade
38% of 13 decks +14% synergy
Windswept Heath
31% of 13 decks +20% synergy
Sungrass Prairie
31% of 13 decks +19% synergy
Sunpetal Grove
31% of 13 decks +7% synergy
Savannah
23% of 13 decks +10% synergy
Selesnya Sanctuary
23% of 13 decks +9% synergy
Fortified Village
23% of 13 decks +8% synergy
Terramorphic Expanse
23% of 13 decks +7% synergy
Myriad Landscape
23% of 13 decks +3% synergy
Evolving Wilds
23% of 13 decks +2% synergy
Exotic Orchard
23% of 13 decks -12% synergy