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.

Trelasarra, Moon Dancer
0.09% of 2285 decks 2 decks
Shalai and Hallar
0.07% of 8221 decks 6 decks
Lathiel, the Bounteous Dawn
0.04% of 4468 decks 2 decks
Kenrith, the Returned King
0.01% of 20704 decks 2 decks
High Synergy Cards
Basking Broodscale
100% of 4 decks +99% synergy
Walking Ballista
92% of 13 decks +90% synergy
Archangel of Thune
85% of 13 decks +83% synergy
Heliod, Sun-Crowned
85% of 13 decks +83% synergy
The Red Terror
75% of 8 decks +75% synergy
The Ozolith
77% of 13 decks +73% synergy
All Will Be One
75% of 8 decks +73% synergy
Scurry Oak
69% of 13 decks +68% synergy
Dockside Extortionist
75% of 8 decks +67% synergy
Ozolith, the Shattered Spire
69% of 13 decks +66% synergy
Top Cards
Kami of Whispered Hopes
69% of 13 decks +66% synergy
Hardened Scales
69% of 13 decks +65% synergy
Esper Sentinel
69% of 13 decks +60% synergy
War Elemental
62% of 8 decks +62% synergy
Deflecting Swat
62% of 8 decks +55% synergy
Triskelion
54% of 13 decks +53% synergy
Ivy Lane Denizen
54% of 13 decks +53% synergy
Cleric Class
54% of 13 decks +53% synergy
Worldly Tutor
54% of 13 decks +47% synergy
Enlightened Tutor
54% of 13 decks +46% synergy
Creatures
Voice of the Blessed
46% of 13 decks +46% synergy
Vigor
46% of 13 decks +45% synergy
Birds of Paradise
46% of 13 decks +34% synergy
Trelasarra, Moon Dancer
38% of 13 decks +38% synergy
Wildwood Scourge
38% of 13 decks +38% synergy
Emiel the Blessed
38% of 13 decks +38% synergy
Conclave Mentor
38% of 13 decks +38% synergy
Essence Warden
38% of 13 decks +37% synergy
Rosie Cotton of South Lane
38% of 13 decks +37% synergy
Soul Warden
38% of 13 decks +36% synergy
Kutzil, Malamet Exemplar
33% of 9 decks +29% synergy
Celestial Unicorn
31% of 13 decks +31% synergy
Speaker of the Heavens
31% of 13 decks +30% synergy
Soul's Attendant
31% of 13 decks +29% synergy
Delighted Halfling
31% of 13 decks +24% synergy
Phyrexian Devourer
23% of 13 decks +23% synergy
Enduring Scalelord
23% of 13 decks +23% synergy
Herd Baloth
23% of 13 decks +23% synergy
Good-Fortune Unicorn
23% of 13 decks +22% synergy
Daxos, Blessed by the Sun
23% of 13 decks +22% synergy
Abzan Falconer
23% of 13 decks +22% synergy
Prosperous Innkeeper
23% of 13 decks +22% synergy
Devoted Druid
23% of 13 decks +22% synergy
Gyre Sage
23% of 13 decks +21% synergy
Serra Ascendant
23% of 13 decks +21% synergy
Temur Sabertooth
23% of 13 decks +21% synergy
Destiny Spinner
23% of 13 decks +21% synergy
Archivist of Oghma
23% of 13 decks +20% synergy
Drannith Magistrate
23% of 13 decks +20% synergy
Champion of Lambholt
23% of 13 decks +20% synergy
Bloom Tender
23% of 13 decks +19% synergy
Ornithopter of Paradise
23% of 13 decks +19% synergy
Eternal Witness
23% of 13 decks +13% synergy
Instants
Swords to Plowshares
54% of 13 decks +25% synergy
Red Elemental Blast
50% of 8 decks +47% synergy
Lightning Bolt
50% of 8 decks +45% synergy
Eladamri's Call
38% of 13 decks +36% synergy
Silence
38% of 13 decks +36% synergy
Generous Gift
38% of 13 decks +27% synergy
Path to Exile
38% of 13 decks +18% synergy
Seething Song
38% of 8 decks +35% synergy
Pyroblast
38% of 8 decks +34% synergy
Abrade
38% of 8 decks +32% synergy
Tamiyo's Safekeeping
31% of 13 decks +28% synergy
Heroic Intervention
31% of 13 decks +17% synergy
Beast Within
31% of 13 decks +12% synergy
Nature's Claim
23% of 13 decks +18% synergy
Sorceries
Gamble
50% of 8 decks +45% synergy
Faithless Looting
38% of 8 decks +29% synergy
Jeska's Will
38% of 8 decks +29% synergy
Farseek
31% of 13 decks +15% synergy
Finale of Devastation
23% of 13 decks +19% synergy
Three Visits
23% of 13 decks +11% synergy
Nature's Lore
23% of 13 decks +8% synergy
Utility Artifacts
Shadowspear
31% of 13 decks +27% synergy
Aetherflux Reservoir
31% of 13 decks +27% synergy
Trinisphere
23% of 13 decks +23% synergy
Well of Lost Dreams
23% of 13 decks +21% synergy
The Great Henge
23% of 13 decks +18% synergy
Swiftfoot Boots
23% of 13 decks -5% synergy
Enchantments
Smothering Tithe
54% of 13 decks +42% synergy
Quest for Pure Flame
50% of 8 decks +50% synergy
Branching Evolution
46% of 13 decks +44% synergy
Light of Promise
38% of 13 decks +38% synergy
Mayael's Aria
38% of 8 decks +37% synergy
Survival of the Fittest
31% of 13 decks +30% synergy
Sylvan Library
31% of 13 decks +25% synergy
Ajani's Welcome
23% of 13 decks +22% synergy
Dawn of Hope
23% of 13 decks +22% synergy
Carpet of Flowers
23% of 13 decks +21% synergy
Cathars' Crusade
23% of 13 decks +20% synergy
Planeswalkers
Ajani, the Greathearted
23% of 13 decks +22% synergy
Utility Lands
Gavony Township
46% of 13 decks +44% synergy
Urza's Saga
31% of 13 decks +24% synergy
Ancient Tomb
31% of 13 decks +20% synergy
Strip Mine
23% of 13 decks +20% synergy
Boseiju, Who Endures
23% of 13 decks +14% synergy
Mana Artifacts
Sol Ring
92% of 13 decks +8% synergy
Arcane Signet
69% of 13 decks -2% synergy
Jeweled Lotus
38% of 13 decks +31% synergy
Mana Crypt
38% of 13 decks +27% synergy
Talisman of Impulse
38% of 8 decks +36% synergy
Chrome Mox
31% of 13 decks +24% synergy
Pristine Talisman
23% of 13 decks +22% synergy
Lands
Command Tower
77% of 13 decks +3% synergy
Taiga
75% of 8 decks +72% synergy
Stomping Ground
75% of 8 decks +66% synergy
Plateau
62% of 8 decks +60% synergy
Jetmir's Garden
62% of 8 decks +58% synergy
Savannah
54% of 13 decks +51% synergy
Temple Garden
54% of 13 decks +45% synergy
Windswept Heath
54% of 13 decks +44% synergy
Sacred Foundry
50% of 8 decks +42% synergy
Wooded Foothills
46% of 13 decks +36% synergy
Arid Mesa
38% of 13 decks +28% synergy
Cragcrown Pathway
38% of 8 decks +36% synergy
Needleverge Pathway
38% of 8 decks +35% synergy
Karplusan Forest
38% of 8 decks +34% synergy
Rootbound Crag
38% of 8 decks +32% synergy
Battlefield Forge
38% of 8 decks +32% synergy
Spectator Seating
38% of 8 decks +32% synergy
Clifftop Retreat
38% of 8 decks +31% synergy
Branchloft Pathway
31% of 13 decks +29% synergy
Canopy Vista
31% of 13 decks +23% synergy
Brushland
23% of 13 decks +20% synergy
Sunpetal Grove
23% of 13 decks +18% synergy
Mana Confluence
23% of 13 decks +16% synergy
City of Brass
23% of 13 decks +15% synergy