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
0.19% of 4802 decks 9 decks
Shalai and Hallar
0.02% of 9290 decks 2 decks
Trelasarra, Moon Dancer
0.04% of 2289 decks 1 decks
Atraxa, Praetors' Voice
0.00% of 35754 decks 1 decks
Kenrith, the Returned King
0.00% of 21799 decks 1 decks
High Synergy Cards
Voice of the Blessed
71% of 14 decks +70% synergy
Heliod, Sun-Crowned
71% of 14 decks +68% synergy
Conclave Mentor
71% of 14 decks +67% synergy
Archangel of Thune
64% of 14 decks +62% synergy
Soul Warden
64% of 14 decks +59% synergy
Envoy of the Ancestors
57% of 7 decks +55% synergy
Cleric Class
57% of 14 decks +55% synergy
The Ozolith
57% of 14 decks +54% synergy
Aetherflux Reservoir
57% of 14 decks +53% synergy
Trelasarra, Moon Dancer
50% of 14 decks +49% synergy
Top Cards
Hardened Scales
57% of 14 decks +48% synergy
Ajani's Pridemate
50% of 14 decks +49% synergy
Kami of Whispered Hopes
50% of 14 decks +42% synergy
Cultivate
50% of 14 decks +4% synergy
Abzan Battle Priest
43% of 14 decks +42% synergy
Rhox Faithmender
43% of 14 decks +41% synergy
Walking Ballista
43% of 14 decks +40% synergy
Essence Warden
43% of 14 decks +40% synergy
Ajani, the Greathearted
43% of 14 decks +40% synergy
Soul's Attendant
43% of 14 decks +39% synergy
Creatures
Ocelot Pride
43% of 7 decks +37% synergy
Esper Sentinel
43% of 14 decks +22% synergy
Kutzil, Malamet Exemplar
42% of 12 decks +22% synergy
Basking Broodscale
38% of 8 decks +35% synergy
Angel of Vitality
36% of 14 decks +34% synergy
Sunscorch Regent
36% of 14 decks +34% synergy
Daxos, Blessed by the Sun
36% of 14 decks +33% synergy
Elenda's Hierophant
33% of 12 decks +30% synergy
Ageless Entity
29% of 14 decks +28% synergy
Triskelion
29% of 14 decks +28% synergy
Accomplished Alchemist
29% of 14 decks +28% synergy
Lunarch Veteran
29% of 14 decks +28% synergy
Felidar Sovereign
29% of 14 decks +26% synergy
Trostani, Selesnya's Voice
29% of 14 decks +26% synergy
Abzan Falconer
29% of 14 decks +26% synergy
Good-Fortune Unicorn
29% of 14 decks +26% synergy
Kodama of the West Tree
29% of 14 decks +24% synergy
Shalai, Voice of Plenty
29% of 14 decks +22% synergy
Birds of Paradise
29% of 14 decks +2% synergy
Gideon's Company
21% of 14 decks +21% synergy
Twinblade Paladin
21% of 14 decks +21% synergy
Loyal Unicorn
21% of 14 decks +21% synergy
Tuskguard Captain
21% of 14 decks +21% synergy
Herd Baloth
21% of 14 decks +20% synergy
Nykthos Paragon
21% of 14 decks +20% synergy
Celestine, the Living Saint
21% of 14 decks +20% synergy
Scurry Oak
21% of 14 decks +20% synergy
Fertilid
21% of 14 decks +19% synergy
Hamza, Guardian of Arashin
21% of 14 decks +19% synergy
Prosperous Innkeeper
21% of 14 decks +19% synergy
Gala Greeters
21% of 14 decks +18% synergy
Vorinclex, Monstrous Raider
21% of 14 decks +18% synergy
Serra Ascendant
21% of 14 decks +17% synergy
Champion of Lambholt
21% of 14 decks +14% synergy
Evolution Sage
21% of 14 decks +14% synergy
Instants
Eladamri's Call
43% of 14 decks +32% synergy
Heroic Intervention
43% of 14 decks +13% synergy
Path to Exile
43% of 14 decks -3% synergy
Swords to Plowshares
43% of 14 decks -20% synergy
Inspiring Call
36% of 14 decks +28% synergy
Enlightened Tutor
29% of 14 decks +11% synergy
Pulse of Murasa
21% of 14 decks +21% synergy
Heliod's Intervention
21% of 14 decks +18% synergy
Return to Nature
21% of 14 decks +15% synergy
Tamiyo's Safekeeping
21% of 14 decks +15% synergy
Worldly Tutor
21% of 14 decks +7% synergy
Teferi's Protection
21% of 14 decks +2% synergy
Generous Gift
21% of 14 decks -4% synergy
Sorceries
Damning Verdict
29% of 14 decks +27% synergy
Farseek
29% of 14 decks -6% synergy
Scale the Heights
21% of 14 decks +21% synergy
Fumigate
21% of 14 decks +18% synergy
Kodama's Reach
21% of 14 decks -10% synergy
Nature's Lore
21% of 14 decks -11% synergy
Rampant Growth
21% of 14 decks -13% synergy
Utility Artifacts
Well of Lost Dreams
36% of 14 decks +34% synergy
Alhammarret's Archive
36% of 14 decks +34% synergy
The Great Henge
29% of 14 decks +19% synergy
Swiftfoot Boots
29% of 14 decks +1% synergy
Ozolith, the Shattered Spire
21% of 14 decks +15% synergy
Enchantments
Innkeeper's Talent
75% of 4 decks +66% synergy
Light of Promise
36% of 14 decks +35% synergy
Authority of the Consuls
36% of 14 decks +31% synergy
Sunbond
29% of 14 decks +28% synergy
Sylvan Library
29% of 14 decks +17% synergy
Smothering Tithe
29% of 14 decks +4% synergy
Noble Purpose
21% of 14 decks +21% synergy
Boon Reflection
21% of 14 decks +21% synergy
Branching Evolution
21% of 14 decks +16% synergy
Mirari's Wake
21% of 14 decks +8% synergy
Planeswalkers
Ajani, Strength of the Pride
21% of 14 decks +20% synergy
Utility Lands
Gavony Township
57% of 14 decks +48% synergy
Karn's Bastion
36% of 14 decks +31% synergy
Rogue's Passage
36% of 14 decks +16% synergy
Radiant Fountain
29% of 14 decks +27% synergy
Boseiju, Who Endures
29% of 14 decks +9% synergy
Reliquary Tower
29% of 14 decks -1% synergy
Yavimaya, Cradle of Growth
21% of 14 decks +12% synergy
Mosswort Bridge
21% of 14 decks +11% synergy
Mana Artifacts
Sol Ring
71% of 14 decks -13% synergy
Arcane Signet
64% of 14 decks -8% synergy
Lands
Stomping Ground
100% of 3 decks +59% synergy
Command Tower
86% of 14 decks +12% synergy
Blossoming Sands
57% of 14 decks +50% synergy
Temple Garden
50% of 14 decks +10% synergy
Graypelt Refuge
43% of 14 decks +39% synergy
Brushland
43% of 14 decks +27% synergy
Canopy Vista
43% of 14 decks +7% synergy
Sunpetal Grove
36% of 14 decks +12% synergy
Bountiful Promenade
36% of 14 decks +12% synergy
Windswept Heath
29% of 14 decks +18% synergy
Sungrass Prairie
29% of 14 decks +17% synergy
Razorverge Thicket
21% of 14 decks +17% synergy
Branchloft Pathway
21% of 14 decks +13% synergy
Savannah
21% of 14 decks +8% synergy
Selesnya Sanctuary
21% of 14 decks +7% synergy
Fortified Village
21% of 14 decks +6% synergy
Terramorphic Expanse
21% of 14 decks +6% synergy
Overgrown Farmland
21% of 14 decks +5% synergy
Myriad Landscape
21% of 14 decks +2% synergy
Evolving Wilds
21% of 14 decks +0% synergy
Exotic Orchard
21% of 14 decks -14% synergy