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 2000 decks 4 decks
Lathiel, the Bounteous Dawn
0.06% of 4802 decks 3 decks
Skullbriar, the Walking Grave
0.03% of 6626 decks 2 decks
Agatha of the Vile Cauldron
0.05% of 4015 decks 2 decks
Atraxa, Praetors' Voice
0.00% of 35754 decks 1 decks
Gyome, Master Chef
0.03% of 3883 decks 1 decks
Shalai and Hallar
0.01% of 9290 decks 1 decks
Leinore, Autumn Sovereign
0.05% of 1926 decks 1 decks
Lily Bowen, Raging Grandma
0.33% of 299 decks 1 decks
Kenrith, the Returned King
0.00% of 21799 decks 1 decks
Ezuri, Claw of Progress
0.02% of 6313 decks 1 decks
Dina, Soul Steeper
0.01% of 7764 decks 1 decks
High Synergy Cards
Archangel of Thune
86% of 7 decks +83% synergy
Celestial Unicorn
57% of 7 decks +57% synergy
Ajani's Pridemate
57% of 7 decks +56% synergy
Abzan Battle Priest
57% of 7 decks +56% synergy
Abzan Falconer
57% of 7 decks +55% synergy
Heliod, Sun-Crowned
57% of 7 decks +54% synergy
Conclave Mentor
57% of 7 decks +53% synergy
Veinwitch Coven
50% of 10 decks +49% synergy
Corpsejack Menace
50% of 10 decks +45% synergy
Triskelion
42% of 19 decks +42% synergy
Top Cards
Reanimate
50% of 10 decks +34% synergy
Cultivate
42% of 19 decks -4% synergy
Jarad, Golgari Lich Lord
40% of 10 decks +37% synergy
Whip of Erebos
40% of 10 decks +37% synergy
Elves of Deep Shadow
40% of 10 decks +29% synergy
Black Market Connections
40% of 10 decks +29% synergy
The Ozolith
37% of 19 decks +33% synergy
Kami of Whispered Hopes
37% of 19 decks +29% synergy
Hardened Scales
37% of 19 decks +28% synergy
Walking Ballista
32% of 19 decks +29% synergy
Creatures
Kutzil, Malamet Exemplar
60% of 5 decks +41% synergy
Alharu, Solemn Ritualist
43% of 7 decks +43% synergy
Esper Sentinel
43% of 7 decks +22% synergy
Incubation Druid
32% of 19 decks +27% synergy
Forgotten Ancient
32% of 19 decks +26% synergy
Blood Researcher
30% of 10 decks +30% synergy
Sangromancer
30% of 10 decks +28% synergy
Blossoming Bogbeast
26% of 19 decks +25% synergy
Steelbane Hydra
26% of 19 decks +25% synergy
Essence Warden
26% of 19 decks +24% synergy
Llanowar Elves
26% of 19 decks +5% synergy
Accomplished Alchemist
21% of 19 decks +20% synergy
Slippery Bogbonder
21% of 19 decks +20% synergy
Vigor
21% of 19 decks +18% synergy
Kalonian Hydra
21% of 19 decks +18% synergy
Devoted Druid
21% of 19 decks +18% synergy
Ezzaroot Channeler
16% of 19 decks +15% synergy
Biophagus
16% of 19 decks +14% synergy
Silverback Elder
16% of 19 decks +13% synergy
Kodama of the West Tree
16% of 19 decks +12% synergy
Eternal Witness
16% of 19 decks -5% synergy
Instants
Teferi's Protection
43% of 7 decks +23% synergy
Path to Exile
43% of 7 decks -3% synergy
Reckless Spite
30% of 10 decks +30% synergy
Dark Ritual
30% of 10 decks +8% synergy
Worldly Tutor
26% of 19 decks +12% synergy
Inscription of Abundance
21% of 19 decks +19% synergy
Ruinous Intrusion
16% of 19 decks +15% synergy
Momentous Fall
16% of 19 decks +14% synergy
Snakeskin Veil
16% of 19 decks +12% synergy
Heroic Intervention
16% of 19 decks -14% synergy
Beast Within
16% of 19 decks -23% synergy
Sorceries
Nature's Lore
32% of 19 decks -0% synergy
Feed the Swarm
30% of 10 decks +12% synergy
Demonic Tutor
30% of 10 decks +8% synergy
Farseek
21% of 19 decks -13% synergy
Bala Ged Recovery
16% of 19 decks +7% synergy
Shamanic Revelation
16% of 19 decks +7% synergy
Rishkar's Expertise
16% of 19 decks +5% synergy
Three Visits
16% of 19 decks -9% synergy
Kodama's Reach
16% of 19 decks -16% synergy
Rampant Growth
16% of 19 decks -19% synergy
Utility Artifacts
Shadowspear
32% of 19 decks +28% synergy
Aetherflux Reservoir
32% of 19 decks +28% synergy
Alhammarret's Archive
21% of 19 decks +19% synergy
Thousand-Year Elixir
21% of 19 decks +19% synergy
The Great Henge
21% of 19 decks +11% synergy
Animation Module
16% of 19 decks +15% synergy
Cosmos Elixir
16% of 19 decks +15% synergy
Phyrexian Altar
16% of 19 decks +12% synergy
Ozolith, the Shattered Spire
16% of 19 decks +10% synergy
Lightning Greaves
16% of 19 decks -10% synergy
Swiftfoot Boots
16% of 19 decks -12% synergy
Enchantments
Virtue of Persistence
43% of 7 decks +40% synergy
Smothering Tithe
43% of 7 decks +18% 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
Branching Evolution
26% of 19 decks +21% synergy
Sylvan Library
26% of 19 decks +15% synergy
Garruk's Uprising
26% of 19 decks +11% synergy
Court of Garenbrig
21% of 14 decks +18% synergy
Hydra's Growth
21% of 19 decks +19% synergy
Myth Unbound
16% of 19 decks +15% synergy
Death's Presence
16% of 19 decks +15% synergy
Fight Rigging
16% of 19 decks +15% synergy
Tribute to the World Tree
16% of 19 decks +8% synergy
Doubling Season
16% of 19 decks +7% synergy
Wild Growth
16% of 19 decks +5% synergy
Utility Lands
Gavony Township
43% of 7 decks +33% synergy
Rogue's Passage
26% of 19 decks +7% synergy
Radiant Fountain
16% of 19 decks +15% synergy
Urborg, Tomb of Yawgmoth
16% of 19 decks +6% synergy
Ancient Tomb
16% of 19 decks +5% synergy
Boseiju, Who Endures
16% of 19 decks -4% synergy
Mana Artifacts
Sol Ring
74% of 19 decks -11% synergy
Arcane Signet
68% of 19 decks -4% synergy
Pristine Talisman
16% of 19 decks +14% synergy
Mana Vault
16% of 19 decks +9% synergy
Lands
Command Tower
79% of 19 decks +5% synergy
Stomping Ground
75% of 4 decks +34% synergy
Tainted Wood
50% of 10 decks +37% synergy
Llanowar Wastes
50% of 10 decks +24% synergy
Blossoming Sands
43% of 7 decks +36% synergy
Canopy Vista
43% of 7 decks +7% synergy
Overgrown Tomb
40% of 10 decks -2% synergy
Exotic Orchard
37% of 19 decks +1% 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
21% of 19 decks +11% synergy
Verdant Catacombs
16% of 19 decks +4% synergy
Myriad Landscape
16% of 19 decks -4% synergy