Agatha's Soul Cauldron + Spike Feeder + Ajani's Pridemate

Agatha's Soul Cauldron
Spike Feeder
Ajani's Pridemate

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

Shalai and Hallar
0.08% of 8949 decks 7 decks
Lathiel, the Bounteous Dawn
0.08% of 4719 decks 4 decks
Trelasarra, Moon Dancer
0.13% of 2289 decks 3 decks
Kenrith, the Returned King
0.01% of 21513 decks 2 decks
Reyhan, Last of the Abzan // Yoshimaru, Ever Faithful
0.06% of 1730 decks 1 decks
Atraxa, Praetors' Voice
0.00% of 35211 decks 1 decks
High Synergy Cards
Heliod, Sun-Crowned
83% of 18 decks +80% synergy
The Red Terror
78% of 9 decks +77% synergy
Walking Ballista
78% of 18 decks +75% synergy
All Will Be One
78% of 9 decks +75% synergy
Archangel of Thune
72% of 18 decks +70% synergy
Basking Broodscale
71% of 7 decks +69% synergy
War Elemental
67% of 9 decks +66% synergy
The Ozolith
67% of 18 decks +63% synergy
Dockside Extortionist
67% of 9 decks +54% synergy
Hardened Scales
61% of 18 decks +52% synergy
Top Cards
Esper Sentinel
72% of 18 decks +52% synergy
Ozolith, the Shattered Spire
56% of 18 decks +49% synergy
Gamble
56% of 9 decks +46% synergy
Deflecting Swat
56% of 9 decks +39% synergy
Triskelion
50% of 18 decks +50% synergy
Voice of the Blessed
50% of 18 decks +49% synergy
Scurry Oak
50% of 18 decks +48% synergy
Cleric Class
50% of 18 decks +47% synergy
Kami of Whispered Hopes
50% of 18 decks +42% synergy
Eladamri's Call
50% of 18 decks +39% synergy
Creatures
Trelasarra, Moon Dancer
44% of 18 decks +43% synergy
Celestial Unicorn
39% of 18 decks +39% synergy
Ivy Lane Denizen
39% of 18 decks +37% synergy
Vigor
39% of 18 decks +36% synergy
Conclave Mentor
39% of 18 decks +35% synergy
Birds of Paradise
39% of 18 decks +12% synergy
Kutzil, Malamet Exemplar
36% of 14 decks +16% synergy
Essence Warden
33% of 18 decks +31% synergy
Soul Warden
33% of 18 decks +28% synergy
Simian Spirit Guide
33% of 9 decks +28% synergy
Wildwood Scourge
28% of 18 decks +27% synergy
Speaker of the Heavens
28% of 18 decks +27% synergy
Prosperous Innkeeper
28% of 18 decks +25% synergy
Soul's Attendant
28% of 18 decks +24% synergy
Emiel the Blessed
28% of 18 decks +24% synergy
Rosie Cotton of South Lane
28% of 18 decks +24% synergy
Bloom Tender
28% of 18 decks +20% synergy
Daxos, Blessed by the Sun
22% of 18 decks +20% synergy
Abzan Falconer
22% of 18 decks +20% synergy
Gyre Sage
22% of 18 decks +18% synergy
Ornithopter of Paradise
22% of 18 decks +18% synergy
Incubation Druid
22% of 18 decks +17% synergy
Shalai, Voice of Plenty
22% of 18 decks +15% synergy
Delighted Halfling
22% of 18 decks +8% synergy
Llanowar Elves
22% of 18 decks +1% synergy
Elenda's Hierophant
21% of 14 decks +18% synergy
Phyrexian Devourer
17% of 18 decks +17% synergy
Gideon's Company
17% of 18 decks +17% synergy
Twinblade Paladin
17% of 18 decks +17% synergy
Ageless Entity
17% of 18 decks +16% synergy
Enduring Scalelord
17% of 18 decks +16% synergy
Impassioned Orator
17% of 18 decks +16% synergy
Herd Baloth
17% of 18 decks +16% synergy
Abzan Battle Priest
17% of 18 decks +15% synergy
Angel of Vitality
17% of 18 decks +15% synergy
Rhox Faithmender
17% of 18 decks +15% synergy
Hamza, Guardian of Arashin
17% of 18 decks +14% synergy
Good-Fortune Unicorn
17% of 18 decks +14% synergy
Devoted Druid
17% of 18 decks +14% synergy
Elvish Spirit Guide
17% of 18 decks +13% synergy
Suture Priest
17% of 18 decks +13% synergy
Temur Sabertooth
17% of 18 decks +13% synergy
Vorinclex, Monstrous Raider
17% of 18 decks +13% synergy
Serra Ascendant
17% of 18 decks +13% synergy
Destiny Spinner
17% of 18 decks +12% synergy
Archivist of Oghma
17% of 18 decks +10% synergy
Drannith Magistrate
17% of 18 decks +10% synergy
Champion of Lambholt
17% of 18 decks +10% synergy
Evolution Sage
17% of 18 decks +10% synergy
Grand Abolisher
17% of 18 decks +8% synergy
Instants
Worldly Tutor
50% of 18 decks +36% synergy
Enlightened Tutor
50% of 18 decks +32% synergy
Swords to Plowshares
50% of 18 decks -13% synergy
Red Elemental Blast
44% of 9 decks +38% synergy
Lightning Bolt
44% of 9 decks +34% synergy
Path to Exile
44% of 18 decks -1% synergy
Silence
39% of 18 decks +32% synergy
Generous Gift
39% of 18 decks +13% synergy
Heroic Intervention
39% of 18 decks +9% synergy
Seething Song
33% of 9 decks +27% synergy
Pyroblast
33% of 9 decks +27% synergy
Abrade
33% of 9 decks +22% synergy
Tamiyo's Safekeeping
28% of 18 decks +21% synergy
Beast Within
22% of 18 decks -17% synergy
Take Up the Shield
17% of 18 decks +16% synergy
Pledge of Unity
17% of 18 decks +15% synergy
Heliod's Intervention
17% of 18 decks +13% synergy
Chord of Calling
17% of 18 decks +11% synergy
Veil of Summer
17% of 18 decks +10% synergy
Return to Nature
17% of 18 decks +10% synergy
Nature's Claim
17% of 18 decks +7% synergy
Teferi's Protection
17% of 18 decks -3% synergy
Sorceries
Faithless Looting
33% of 9 decks +17% synergy
Jeska's Will
33% of 9 decks +16% synergy
Farseek
33% of 18 decks -1% synergy
Nature's Lore
28% of 18 decks -4% synergy
Three Visits
22% of 18 decks -3% synergy
Kodama's Reach
22% of 18 decks -9% synergy
Cultivate
22% of 18 decks -24% synergy
Damning Verdict
17% of 18 decks +15% synergy
Finale of Devastation
17% of 18 decks +8% synergy
Utility Artifacts
Shadowspear
33% of 18 decks +30% synergy
Aetherflux Reservoir
28% of 18 decks +24% synergy
Swiftfoot Boots
22% of 18 decks -6% synergy
Trinisphere
17% of 18 decks +16% synergy
Well of Lost Dreams
17% of 18 decks +15% synergy
The Great Henge
17% of 18 decks +7% synergy
Enchantments
Smothering Tithe
50% of 18 decks +25% synergy
Quest for Pure Flame
44% of 9 decks +44% synergy
Light of Promise
33% of 18 decks +32% synergy
Mayael's Aria
33% of 9 decks +31% synergy
Branching Evolution
33% of 18 decks +28% synergy
Sylvan Library
28% of 18 decks +16% synergy
Ajani's Welcome
22% of 18 decks +21% synergy
Survival of the Fittest
22% of 18 decks +20% synergy
Dawn of Hope
22% of 18 decks +20% synergy
Authority of the Consuls
22% of 18 decks +18% synergy
Cathars' Crusade
22% of 18 decks +17% synergy
Carpet of Flowers
17% of 18 decks +13% synergy
Planeswalkers
Ajani, the Greathearted
33% of 18 decks +30% synergy
Ajani, Strength of the Pride
17% of 18 decks +15% synergy
Utility Lands
Gavony Township
44% of 18 decks +35% synergy
Boseiju, Who Endures
33% of 18 decks +14% synergy
Karn's Bastion
28% of 18 decks +23% synergy
Ancient Tomb
28% of 18 decks +17% synergy
Urza's Saga
22% of 18 decks +15% synergy
Strip Mine
17% of 18 decks +14% synergy
Mana Artifacts
Sol Ring
83% of 18 decks -1% synergy
Arcane Signet
61% of 18 decks -11% synergy
Talisman of Impulse
33% of 9 decks +25% synergy
Jeweled Lotus
28% of 18 decks +22% synergy
Mana Crypt
28% of 18 decks +19% synergy
Chrome Mox
22% of 18 decks +16% synergy
Pristine Talisman
17% of 18 decks +15% synergy
Talisman of Unity
17% of 18 decks +9% synergy
Lands
Stomping Ground
78% of 9 decks +36% synergy
Command Tower
78% of 18 decks +4% synergy
Taiga
67% of 9 decks +54% synergy
Temple Garden
61% of 18 decks +21% synergy
Needleverge Pathway
56% of 9 decks +46% synergy
Plateau
56% of 9 decks +43% synergy
Jetmir's Garden
56% of 9 decks +22% synergy
Sacred Foundry
56% of 9 decks +19% synergy
Cragcrown Pathway
44% of 9 decks +36% synergy
Windswept Heath
44% of 18 decks +34% synergy
Savannah
44% of 18 decks +31% synergy
Karplusan Forest
44% of 9 decks +28% synergy
Rootbound Crag
44% of 9 decks +21% synergy
Spectator Seating
44% of 9 decks +19% synergy
Battlefield Forge
44% of 9 decks +19% synergy
Clifftop Retreat
44% of 9 decks +16% synergy
Wooded Foothills
39% of 18 decks +29% synergy
Arid Mesa
33% of 18 decks +23% synergy
Brushland
33% of 18 decks +17% synergy
Bountiful Promenade
33% of 18 decks +9% synergy
Spire Garden
33% of 9 decks +9% synergy
Canopy Vista
33% of 18 decks -3% synergy
Branchloft Pathway
28% of 18 decks +19% synergy
Sunpetal Grove
28% of 18 decks +4% synergy
Exotic Orchard
28% of 18 decks -8% synergy
Blossoming Sands
22% of 18 decks +16% synergy
Mana Confluence
22% of 18 decks +15% synergy
City of Brass
22% of 18 decks +14% synergy
Forbidden Orchard
17% of 18 decks +14% synergy
Flooded Strand
17% of 18 decks +6% synergy
Verdant Catacombs
17% of 18 decks +5% synergy