Treebeard, Gracious Host + Agatha's Soul Cauldron + Spike Feeder

Treebeard, Gracious Host
Agatha's Soul Cauldron
Spike Feeder

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

Treebeard, Gracious Host
0.20% of 1476 decks 3 decks
Wylie Duke, Atiin Hero
0.19% of 534 decks 1 decks
Najeela, the Blade-Blossom
0.01% of 10780 decks 1 decks
Rocco, Street Chef
0.01% of 6750 decks 1 decks
Bilbo, Birthday Celebrant
0.02% of 4947 decks 1 decks
Kenrith, the Returned King
0.00% of 21550 decks 1 decks
Lae'zel, Vlaakith's Champion // Master Chef
0.04% of 2246 decks 1 decks
Lathiel, the Bounteous Dawn
0.02% of 4700 decks 1 decks
Trelasarra, Moon Dancer
0.04% of 2288 decks 1 decks
Frodo, Adventurous Hobbit // Sam, Loyal Attendant
0.01% of 14394 decks 1 decks
Palladia-Mors
0.68% of 148 decks 1 decks
Ikra Shidiqi, the Usurper // Tymna the Weaver
0.11% of 909 decks 1 decks
Sisay, Weatherlight Captain
0.01% of 12157 decks 1 decks
High Synergy Cards
Walking Ballista
53% of 15 decks +51% synergy
Heliod, Sun-Crowned
53% of 15 decks +50% synergy
Devoted Druid
47% of 15 decks +44% synergy
Boseiju, Who Endures
60% of 15 decks +40% synergy
Scurry Oak
40% of 15 decks +38% synergy
Yavimaya, Cradle of Growth
47% of 15 decks +37% synergy
Essence Warden
40% of 15 decks +37% synergy
Rosie Cotton of South Lane
40% of 15 decks +36% synergy
Soul Warden
40% of 15 decks +35% synergy
Cleric Class
33% of 15 decks +31% synergy
Top Cards
Heroic Intervention
60% of 15 decks +30% synergy
Path to Exile
60% of 15 decks +15% synergy
Swords to Plowshares
60% of 15 decks -3% synergy
Eladamri's Call
40% of 15 decks +29% synergy
Worldly Tutor
40% of 15 decks +26% synergy
Birds of Paradise
40% of 15 decks +13% synergy
Cultivate
40% of 15 decks -6% synergy
Prosperous Innkeeper
33% of 15 decks +31% synergy
The Gaffer
33% of 15 decks +31% synergy
Soul's Attendant
33% of 15 decks +30% synergy
Creatures
Agatha of the Vile Cauldron
60% of 5 decks +58% synergy
Vito, Thorn of the Dusk Rose
50% of 6 decks +45% synergy
Orcish Bowmasters
50% of 6 decks +39% synergy
Kutzil, Malamet Exemplar
38% of 8 decks +18% synergy
Samwise Gamgee
33% of 15 decks +28% synergy
Kami of Whispered Hopes
33% of 15 decks +26% synergy
Delighted Halfling
33% of 15 decks +19% synergy
Avacyn's Pilgrim
33% of 15 decks +18% synergy
Esper Sentinel
33% of 15 decks +13% synergy
Triskelion
27% of 15 decks +26% synergy
Immaculate Magistrate
27% of 15 decks +25% synergy
Archangel of Thune
27% of 15 decks +24% synergy
Gilded Goose
27% of 15 decks +23% synergy
Gyre Sage
27% of 15 decks +23% synergy
Selvala, Heart of the Wilds
27% of 15 decks +22% synergy
Peregrin Took
27% of 15 decks +21% synergy
Vizier of Remedies
20% of 15 decks +20% synergy
Impassioned Orator
20% of 15 decks +19% synergy
Trelasarra, Moon Dancer
20% of 15 decks +19% synergy
Rhox Faithmender
20% of 15 decks +18% synergy
Lathiel, the Bounteous Dawn
20% of 15 decks +18% synergy
Ivy Lane Denizen
20% of 15 decks +18% synergy
Daxos, Blessed by the Sun
20% of 15 decks +18% synergy
Trostani, Selesnya's Voice
20% of 15 decks +17% synergy
Suture Priest
20% of 15 decks +17% synergy
Academy Manufactor
20% of 15 decks +16% synergy
Serra Ascendant
20% of 15 decks +16% synergy
Conclave Mentor
20% of 15 decks +16% synergy
Farmer Cotton
20% of 15 decks +15% synergy
Ranger-Captain of Eos
20% of 15 decks +15% synergy
Incubation Druid
20% of 15 decks +15% synergy
Forgotten Ancient
20% of 15 decks +14% synergy
Tireless Provisioner
20% of 15 decks +9% synergy
Fyndhorn Elves
20% of 15 decks +7% synergy
Llanowar Elves
20% of 15 decks -1% synergy
Instants
Archdruid's Charm
50% of 6 decks +43% synergy
Chord of Calling
33% of 15 decks +28% synergy
Enlightened Tutor
33% of 15 decks +16% synergy
Reprieve
20% of 15 decks +15% synergy
Veil of Summer
20% of 15 decks +14% synergy
Silence
20% of 15 decks +14% synergy
Teferi's Protection
20% of 15 decks -0% synergy
Beast Within
20% of 15 decks -19% synergy
Sorceries
Farseek
33% of 15 decks -1% synergy
Finale of Devastation
27% of 15 decks +18% synergy
Tooth and Nail
20% of 15 decks +18% synergy
Green Sun's Zenith
20% of 15 decks +14% synergy
Rampant Growth
20% of 15 decks -15% synergy
Utility Artifacts
Aetherflux Reservoir
33% of 15 decks +30% synergy
The Ozolith
27% of 15 decks +23% synergy
The One Ring
27% of 15 decks +18% synergy
Alhammarret's Archive
20% of 15 decks +18% synergy
Ozolith, the Shattered Spire
20% of 15 decks +14% synergy
Enchantments
Sanguine Bond
50% of 6 decks +44% synergy
Light of Promise
27% of 15 decks +26% synergy
Authority of the Consuls
27% of 15 decks +22% synergy
Cathars' Crusade
27% of 15 decks +21% synergy
Hardened Scales
27% of 15 decks +18% synergy
Sylvan Library
27% of 15 decks +15% synergy
Sunbond
20% of 15 decks +20% synergy
Battles
Planeswalkers
Grist, the Hunger Tide
50% of 6 decks +46% synergy
Ajani, the Greathearted
20% of 15 decks +17% synergy
Utility Lands
The Shire
27% of 15 decks +22% synergy
Karn's Bastion
20% of 15 decks +15% synergy
Urza's Saga
20% of 15 decks +13% synergy
Eiganjo, Seat of the Empire
20% of 15 decks +11% synergy
Ancient Tomb
20% of 15 decks +9% synergy
Mana Artifacts
Sol Ring
67% of 15 decks -18% synergy
Arcane Signet
53% of 15 decks -19% synergy
Chrome Mox
20% of 15 decks +14% synergy
Mana Crypt
20% of 15 decks +11% synergy
Lands
Command Tower
80% of 15 decks +6% synergy
Temple Garden
67% of 15 decks +26% synergy
Overgrown Tomb
67% of 6 decks +24% synergy
Windswept Heath
53% of 15 decks +43% synergy
Lush Portico
50% of 6 decks +38% synergy
Indatha Triome
50% of 6 decks +19% synergy
Godless Shrine
50% of 6 decks +9% synergy
Marsh Flats
47% of 15 decks +35% synergy
Verdant Catacombs
47% of 15 decks +35% synergy
Flooded Strand
40% of 15 decks +29% synergy
Arid Mesa
40% of 15 decks +29% synergy
Savannah
40% of 15 decks +27% synergy
Brushland
40% of 15 decks +24% synergy
Bountiful Promenade
40% of 15 decks +16% synergy
Wooded Foothills
33% of 15 decks +23% synergy
Misty Rainforest
33% of 15 decks +22% synergy
City of Brass
27% of 15 decks +18% synergy
Bloodstained Mire
27% of 15 decks +16% synergy
Sunpetal Grove
27% of 15 decks +3% synergy
Exotic Orchard
27% of 15 decks -9% synergy
Canopy Vista
27% of 15 decks -9% synergy
Razorverge Thicket
20% of 15 decks +15% synergy
Gemstone Caverns
20% of 15 decks +15% synergy
Blossoming Sands
20% of 15 decks +13% synergy
Overgrown Farmland
20% of 15 decks +4% synergy