Agatha's Soul Cauldron + Spike Feeder + Ageless Entity

Agatha's Soul Cauldron
Spike Feeder
Ageless Entity

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

Willowdusk, Essence Seer
0.20% of 2028 decks 4 decks
Lathiel, the Bounteous Dawn
0.04% of 4719 decks 2 decks
Agatha of the Vile Cauldron
0.05% of 3857 decks 2 decks
Skullbriar, the Walking Grave
0.03% of 6486 decks 2 decks
Leinore, Autumn Sovereign
0.05% of 1933 decks 1 decks
Lily Bowen, Raging Grandma
0.35% of 283 decks 1 decks
Kenrith, the Returned King
0.00% of 21513 decks 1 decks
Atraxa, Praetors' Voice
0.00% of 35211 decks 1 decks
Shalai and Hallar
0.01% of 8949 decks 1 decks
Gyome, Master Chef
0.03% of 3903 decks 1 decks
Ezuri, Claw of Progress
0.02% of 6258 decks 1 decks
Dina, Soul Steeper
0.01% of 7676 decks 1 decks
High Synergy Cards
Archangel of Thune
83% of 6 decks +81% synergy
Celestial Unicorn
67% of 6 decks +66% synergy
Veinwitch Coven
50% of 10 decks +49% synergy
Corpsejack Menace
50% of 10 decks +45% synergy
Triskelion
39% of 18 decks +38% synergy
Jarad, Golgari Lich Lord
40% of 10 decks +37% synergy
Whip of Erebos
40% of 10 decks +37% synergy
The Ozolith
39% of 18 decks +35% synergy
Reanimate
50% of 10 decks +34% synergy
Kami of Whispered Hopes
39% of 18 decks +31% synergy
Top Cards
Black Market Connections
40% of 10 decks +29% synergy
Elves of Deep Shadow
40% of 10 decks +29% synergy
Cultivate
39% of 18 decks -8% synergy
Walking Ballista
33% of 18 decks +31% synergy
Hardened Scales
33% of 18 decks +24% synergy
Nature's Lore
33% of 18 decks +1% synergy
Blossoming Bogbeast
28% of 18 decks +27% synergy
Essence Warden
28% of 18 decks +25% synergy
Shadowspear
28% of 18 decks +24% synergy
Aetherflux Reservoir
28% of 18 decks +24% synergy
Creatures
Kutzil, Malamet Exemplar
75% of 4 decks +56% synergy
Alharu, Solemn Ritualist
50% of 6 decks +50% synergy
Ajani's Pridemate
50% of 6 decks +49% synergy
Abzan Battle Priest
50% of 6 decks +49% synergy
Abzan Falconer
50% of 6 decks +47% synergy
Heliod, Sun-Crowned
50% of 6 decks +47% synergy
Conclave Mentor
50% of 6 decks +46% synergy
Blood Researcher
30% of 10 decks +30% synergy
Sangromancer
30% of 10 decks +28% synergy
Incubation Druid
28% of 18 decks +23% synergy
Forgotten Ancient
28% of 18 decks +22% synergy
Accomplished Alchemist
22% of 18 decks +22% synergy
Slippery Bogbonder
22% of 18 decks +21% synergy
Steelbane Hydra
22% of 18 decks +21% synergy
Devoted Druid
22% of 18 decks +19% synergy
Llanowar Elves
22% of 18 decks +1% synergy
Ezzaroot Channeler
17% of 18 decks +16% synergy
Biophagus
17% of 18 decks +15% synergy
Silverback Elder
17% of 18 decks +14% synergy
Vigor
17% of 18 decks +14% synergy
Kalonian Hydra
17% of 18 decks +14% synergy
Kodama of the West Tree
17% of 18 decks +12% synergy
Eternal Witness
17% of 18 decks -4% synergy
Instants
Teferi's Protection
50% of 6 decks +30% synergy
Reckless Spite
30% of 10 decks +30% synergy
Dark Ritual
30% of 10 decks +8% synergy
Worldly Tutor
28% of 18 decks +14% synergy
Ruinous Intrusion
17% of 18 decks +16% synergy
Inscription of Abundance
17% of 18 decks +15% synergy
Momentous Fall
17% of 18 decks +15% synergy
Snakeskin Veil
17% of 18 decks +13% synergy
Beast Within
17% of 18 decks -22% synergy
Sorceries
Feed the Swarm
30% of 10 decks +12% synergy
Demonic Tutor
30% of 10 decks +8% synergy
Farseek
22% of 18 decks -12% synergy
Bala Ged Recovery
17% of 18 decks +8% synergy
Shamanic Revelation
17% of 18 decks +7% synergy
Rishkar's Expertise
17% of 18 decks +6% synergy
Three Visits
17% of 18 decks -8% synergy
Rampant Growth
17% of 18 decks -18% synergy
Utility Artifacts
Alhammarret's Archive
22% of 18 decks +20% synergy
Thousand-Year Elixir
22% of 18 decks +20% synergy
The Great Henge
22% of 18 decks +12% synergy
Animation Module
17% of 18 decks +16% synergy
Cosmos Elixir
17% of 18 decks +16% synergy
Phyrexian Altar
17% of 18 decks +13% synergy
Ozolith, the Shattered Spire
17% of 18 decks +10% synergy
Lightning Greaves
17% of 18 decks -9% synergy
Swiftfoot Boots
17% of 18 decks -11% synergy
Enchantments
Virtue of Persistence
43% of 7 decks +40% synergy
Unspeakable Symbol
30% of 10 decks +29% synergy
Exquisite Blood
30% of 10 decks +25% synergy
Animate Dead
30% of 10 decks +21% synergy
Sylvan Library
28% of 18 decks +16% synergy
Court of Garenbrig
23% of 13 decks +20% synergy
Hydra's Growth
22% of 18 decks +20% synergy
Branching Evolution
22% of 18 decks +17% synergy
Garruk's Uprising
22% of 18 decks +7% synergy
Myth Unbound
17% of 18 decks +16% synergy
Death's Presence
17% of 18 decks +16% synergy
Fight Rigging
17% of 18 decks +15% synergy
Tribute to the World Tree
17% of 18 decks +8% synergy
Doubling Season
17% of 18 decks +8% synergy
Wild Growth
17% of 18 decks +6% synergy
Utility Lands
Rogue's Passage
22% of 18 decks +3% synergy
Radiant Fountain
17% of 18 decks +16% synergy
Urborg, Tomb of Yawgmoth
17% of 18 decks +7% synergy
Ancient Tomb
17% of 18 decks +6% synergy
Boseiju, Who Endures
17% of 18 decks -3% synergy
Mana Artifacts
Sol Ring
72% of 18 decks -12% synergy
Arcane Signet
67% of 18 decks -5% synergy
Pristine Talisman
17% of 18 decks +15% synergy
Mana Vault
17% of 18 decks +10% synergy
Lands
Command Tower
78% of 18 decks +4% synergy
Stomping Ground
75% of 4 decks +34% synergy
Blossoming Sands
50% of 6 decks +43% synergy
Tainted Wood
50% of 10 decks +37% synergy
Llanowar Wastes
50% of 10 decks +24% synergy
Overgrown Tomb
40% of 10 decks -3% synergy
Exotic Orchard
33% of 18 decks -2% synergy
Jungle Hollow
30% of 10 decks +21% synergy
Golgari Rot Farm
30% of 10 decks +12% synergy
Woodland Cemetery
30% of 10 decks +2% synergy
Windswept Heath
22% of 18 decks +12% synergy
Verdant Catacombs
17% of 18 decks +5% synergy
Myriad Landscape
17% of 18 decks -3% synergy