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 1537 decks 3 decks
Frodo, Adventurous Hobbit // Sam, Loyal Attendant
0.01% of 15026 decks 2 decks
Lathiel, the Bounteous Dawn
0.04% of 4765 decks 2 decks
Palladia-Mors
0.64% of 157 decks 1 decks
Kenrith, the Returned King
0.00% of 21646 decks 1 decks
Najeela, the Blade-Blossom
0.01% of 10878 decks 1 decks
Wylie Duke, Atiin Hero
0.18% of 561 decks 1 decks
Trelasarra, Moon Dancer
0.04% of 2276 decks 1 decks
Ikra Shidiqi, the Usurper // Tymna the Weaver
0.11% of 894 decks 1 decks
Sisay, Weatherlight Captain
0.01% of 12246 decks 1 decks
Lae'zel, Vlaakith's Champion // Master Chef
0.04% of 2278 decks 1 decks
Rocco, Street Chef
0.01% of 7041 decks 1 decks
Bilbo, Birthday Celebrant
0.02% of 5166 decks 1 decks
High Synergy Cards
Heliod, Sun-Crowned
59% of 17 decks +56% synergy
Vito, Thorn of the Dusk Rose
57% of 7 decks +52% synergy
Sanguine Bond
57% of 7 decks +51% synergy
Walking Ballista
53% of 17 decks +50% synergy
Boseiju, Who Endures
59% of 17 decks +39% synergy
Essence Warden
41% of 17 decks +39% synergy
Devoted Druid
41% of 17 decks +38% synergy
Soul Warden
41% of 17 decks +36% synergy
Scurry Oak
35% of 17 decks +33% synergy
Cleric Class
35% of 17 decks +33% synergy
Top Cards
Swords to Plowshares
65% of 17 decks +2% synergy
Heroic Intervention
59% of 17 decks +29% synergy
Path to Exile
59% of 17 decks +13% synergy
Birds of Paradise
47% of 17 decks +20% synergy
Eladamri's Call
41% of 17 decks +30% synergy
Kutzil, Malamet Exemplar
40% of 10 decks +21% synergy
Prosperous Innkeeper
35% of 17 decks +33% synergy
The Gaffer
35% of 17 decks +33% synergy
Aetherflux Reservoir
35% of 17 decks +32% synergy
Rosie Cotton of South Lane
35% of 17 decks +31% synergy
Creatures
Agatha of the Vile Cauldron
60% of 5 decks +58% synergy
Dina, Soul Steeper
43% of 7 decks +40% synergy
Orcish Bowmasters
43% of 7 decks +32% synergy
Kami of Whispered Hopes
35% of 17 decks +28% synergy
Delighted Halfling
35% of 17 decks +21% synergy
Avacyn's Pilgrim
35% of 17 decks +21% synergy
Esper Sentinel
35% of 17 decks +15% synergy
Archangel of Thune
29% of 17 decks +27% synergy
Soul's Attendant
29% of 17 decks +26% synergy
Gilded Goose
29% of 17 decks +26% synergy
Samwise Gamgee
29% of 17 decks +24% synergy
Triskelion
24% of 17 decks +23% synergy
Immaculate Magistrate
24% of 17 decks +22% synergy
Trelasarra, Moon Dancer
24% of 17 decks +22% synergy
Rhox Faithmender
24% of 17 decks +22% synergy
Daxos, Blessed by the Sun
24% of 17 decks +21% synergy
Gyre Sage
24% of 17 decks +20% synergy
Serra Ascendant
24% of 17 decks +20% synergy
Conclave Mentor
24% of 17 decks +19% synergy
Selvala, Heart of the Wilds
24% of 17 decks +18% synergy
Peregrin Took
24% of 17 decks +18% synergy
Llanowar Elves
24% of 17 decks +3% synergy
Vizier of Remedies
18% of 17 decks +17% synergy
Hopeful Initiate
18% of 17 decks +17% synergy
Impassioned Orator
18% of 17 decks +17% synergy
Auriok Champion
18% of 17 decks +17% synergy
Lunarch Veteran
18% of 17 decks +17% synergy
Voice of the Blessed
18% of 17 decks +16% synergy
Celestine, the Living Saint
18% of 17 decks +16% synergy
Lathiel, the Bounteous Dawn
18% of 17 decks +16% synergy
Ivy Lane Denizen
18% of 17 decks +16% synergy
Trostani, Selesnya's Voice
18% of 17 decks +15% synergy
Suture Priest
18% of 17 decks +14% synergy
Academy Manufactor
18% of 17 decks +14% synergy
Farmer Cotton
18% of 17 decks +13% synergy
Ranger-Captain of Eos
18% of 17 decks +13% synergy
Incubation Druid
18% of 17 decks +13% synergy
Forgotten Ancient
18% of 17 decks +12% synergy
Tireless Provisioner
18% of 17 decks +6% synergy
Fyndhorn Elves
18% of 17 decks +5% synergy
Instants
Archdruid's Charm
38% of 8 decks +31% synergy
Worldly Tutor
35% of 17 decks +21% synergy
Enlightened Tutor
35% of 17 decks +18% synergy
Chord of Calling
29% of 17 decks +24% synergy
Beast Within
24% of 17 decks -15% synergy
Reprieve
18% of 17 decks +13% synergy
Veil of Summer
18% of 17 decks +11% synergy
Silence
18% of 17 decks +11% synergy
Nature's Claim
18% of 17 decks +8% synergy
Teferi's Protection
18% of 17 decks -2% synergy
Generous Gift
18% of 17 decks -8% synergy
Sorceries
Cultivate
35% of 17 decks -11% synergy
Farseek
29% of 17 decks -5% synergy
Finale of Devastation
24% of 17 decks +15% synergy
Tooth and Nail
18% of 17 decks +16% synergy
The Battle of Bywater
18% of 17 decks +15% synergy
Green Sun's Zenith
18% of 17 decks +11% synergy
Nature's Lore
18% of 17 decks -14% synergy
Rampant Growth
18% of 17 decks -17% synergy
Utility Artifacts
The Ozolith
29% of 17 decks +26% synergy
The One Ring
29% of 17 decks +20% synergy
Alhammarret's Archive
24% of 17 decks +22% synergy
Ozolith, the Shattered Spire
24% of 17 decks +17% synergy
The Great Henge
18% of 17 decks +8% synergy
Swiftfoot Boots
18% of 17 decks -10% synergy
Enchantments
Sylvan Library
35% of 17 decks +24% synergy
Authority of the Consuls
29% of 17 decks +25% synergy
Hardened Scales
29% of 17 decks +20% synergy
Light of Promise
24% of 17 decks +23% synergy
Cathars' Crusade
24% of 17 decks +18% synergy
Sunbond
18% of 17 decks +17% synergy
Battles
Planeswalkers
Grist, the Hunger Tide
43% of 7 decks +39% synergy
Ajani, the Greathearted
24% of 17 decks +20% synergy
Utility Lands
Yavimaya, Cradle of Growth
41% of 17 decks +32% synergy
The Shire
24% of 17 decks +19% synergy
Eiganjo, Seat of the Empire
24% of 17 decks +15% synergy
Karn's Bastion
18% of 17 decks +13% synergy
Urza's Saga
18% of 17 decks +10% synergy
Ancient Tomb
18% of 17 decks +7% synergy
Mana Artifacts
Sol Ring
71% of 17 decks -14% synergy
Arcane Signet
53% of 17 decks -19% synergy
Chrome Mox
18% of 17 decks +11% synergy
Mana Crypt
18% of 17 decks +9% synergy
Lands
Command Tower
82% of 17 decks +8% synergy
Overgrown Tomb
71% of 7 decks +29% synergy
Temple Garden
71% of 17 decks +30% synergy
Godless Shrine
57% of 7 decks +16% synergy
Windswept Heath
53% of 17 decks +42% synergy
Marsh Flats
47% of 17 decks +36% synergy
Verdant Catacombs
47% of 17 decks +36% synergy
Vault of Champions
43% of 7 decks +17% synergy
Undergrowth Stadium
43% of 7 decks +17% synergy
Caves of Koilos
43% of 7 decks +15% synergy
Indatha Triome
43% of 7 decks +12% synergy
Brushland
41% of 17 decks +25% synergy
Bountiful Promenade
41% of 17 decks +17% synergy
Lush Portico
38% of 8 decks +25% synergy
Flooded Strand
35% of 17 decks +25% synergy
Arid Mesa
35% of 17 decks +25% synergy
Savannah
35% of 17 decks +22% synergy
City of Brass
29% of 17 decks +21% synergy
Wooded Foothills
29% of 17 decks +19% synergy
Misty Rainforest
29% of 17 decks +18% synergy
Sunpetal Grove
29% of 17 decks +6% synergy
Wooded Bastion
24% of 17 decks +19% synergy
Razorverge Thicket
24% of 17 decks +19% synergy
Bloodstained Mire
24% of 17 decks +13% synergy
Overgrown Farmland
24% of 17 decks +7% synergy
Exotic Orchard
24% of 17 decks -12% synergy
Canopy Vista
24% of 17 decks -13% synergy
Gemstone Caverns
18% of 17 decks +13% synergy
Blossoming Sands
18% of 17 decks +11% synergy
Branchloft Pathway
18% of 17 decks +9% synergy
Path of Ancestry
18% of 17 decks -4% synergy