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
0.10% of 2063 decks 2 decks
Agatha of the Vile Cauldron
0.06% of 3467 decks 2 decks
Lathiel, the Bounteous Dawn
0.05% of 4443 decks 2 decks
Skullbriar, the Walking Grave
0.03% of 6241 decks 2 decks
High Synergy Cards
Archangel of Thune
80% of 5 decks +79% synergy
Top Cards
Corpsejack Menace
57% of 7 decks +56% synergy
Black Market Connections
57% of 7 decks +52% synergy
Reanimate
57% of 7 decks +49% synergy
The Ozolith
43% of 14 decks +39% synergy
Kami of Whispered Hopes
43% of 14 decks +39% synergy
Hardened Scales
43% of 14 decks +39% synergy
Cultivate
43% of 14 decks +21% synergy
Walking Ballista
36% of 14 decks +33% synergy
Forgotten Ancient
36% of 14 decks +33% synergy
Triskelion
29% of 14 decks +28% synergy
Creatures
Alharu, Solemn Ritualist
60% of 5 decks +60% synergy
Celestial Unicorn
60% of 5 decks +60% synergy
Abzan Battle Priest
60% of 5 decks +59% synergy
Conclave Mentor
60% of 5 decks +59% synergy
Abzan Falconer
60% of 5 decks +59% synergy
Jarad, Golgari Lich Lord
43% of 7 decks +42% synergy
Elves of Deep Shadow
43% of 7 decks +40% synergy
Blossoming Bogbeast
29% of 14 decks +28% synergy
Slippery Bogbonder
29% of 14 decks +28% synergy
Devoted Druid
29% of 14 decks +27% synergy
Incubation Druid
29% of 14 decks +26% synergy
Accomplished Alchemist
21% of 14 decks +21% synergy
Steelbane Hydra
21% of 14 decks +21% synergy
Biophagus
21% of 14 decks +20% synergy
Essence Warden
21% of 14 decks +20% synergy
Kalonian Hydra
21% of 14 decks +20% synergy
Vigor
21% of 14 decks +20% synergy
Kodama of the West Tree
21% of 14 decks +19% synergy
Llanowar Elves
21% of 14 decks +11% synergy
Instants
Ruinous Intrusion
21% of 14 decks +21% synergy
Inscription of Abundance
21% of 14 decks +21% synergy
Momentous Fall
21% of 14 decks +20% synergy
Snakeskin Veil
21% of 14 decks +20% synergy
Worldly Tutor
21% of 14 decks +15% synergy
Sorceries
Feed the Swarm
43% of 7 decks +33% synergy
Nature's Lore
29% of 14 decks +14% synergy
Bala Ged Recovery
21% of 14 decks +17% synergy
Rishkar's Expertise
21% of 14 decks +16% synergy
Three Visits
21% of 14 decks +10% synergy
Farseek
21% of 14 decks +5% synergy
Utility Artifacts
Whip of Erebos
43% of 7 decks +41% synergy
Shadowspear
29% of 14 decks +25% synergy
Aetherflux Reservoir
29% of 14 decks +25% synergy
Animation Module
21% of 14 decks +21% synergy
Alhammarret's Archive
21% of 14 decks +19% synergy
Thousand-Year Elixir
21% of 14 decks +19% synergy
Ozolith, the Shattered Spire
21% of 14 decks +18% synergy
Phyrexian Altar
21% of 14 decks +17% synergy
The Great Henge
21% of 14 decks +17% synergy
Swiftfoot Boots
21% of 14 decks -7% synergy
Enchantments
Court of Garenbrig
30% of 10 decks +28% synergy
Hydra's Growth
29% of 14 decks +27% synergy
Branching Evolution
29% of 14 decks +26% synergy
Garruk's Uprising
29% of 14 decks +22% synergy
Myth Unbound
21% of 14 decks +21% synergy
Death's Presence
21% of 14 decks +21% synergy
Fight Rigging
21% of 14 decks +21% synergy
Doubling Season
21% of 14 decks +17% synergy
Tribute to the World Tree
21% of 14 decks +17% synergy
Sylvan Library
21% of 14 decks +16% synergy
Utility Lands
Rogue's Passage
21% of 14 decks +2% synergy
Mana Artifacts
Sol Ring
71% of 14 decks -13% synergy
Arcane Signet
64% of 14 decks -7% synergy
Lands
Command Tower
79% of 14 decks +5% synergy
Blossoming Sands
60% of 5 decks +59% synergy
Tainted Wood
43% of 7 decks +40% synergy
Llanowar Wastes
43% of 7 decks +37% synergy
Overgrown Tomb
43% of 7 decks +34% synergy
Exotic Orchard
29% of 14 decks -7% synergy
Myriad Landscape
21% of 14 decks +1% synergy