Druid's Call + Cathars' Crusade + Walking Ballista + Pir, Imaginative Rascal

Druid's Call
Cathars' Crusade
Walking Ballista
Pir, Imaginative Rascal

Requires
Druid's Call must be on the battlefield. Cathars' Crusade must be on the battlefield. Walking Ballista must be on the battlefield. Pir, Imaginative Rascal must be on the battlefield. Druid's Call attached to Walking Ballista. Walking Ballista has at least three +1/+1 counters.
Steps
  1. Activate Walking Ballista's first ability by removing a +1/+1 counter from it, dealing 1 damage to itself.
  2. Druid's Call triggers, creating a 1/1 Squirrel creature token.
  3. The Squirrel enters the battlefield, triggering Cathars' Crusade, putting two +1/+1 counters on each creature you control.
  4. Repeat.
Results
Infinite +1/+1 counters. Infinite creature tokens. Infinite ETB.

Ikra Shidiqi, the Usurper // Yoshimaru, Ever Faithful
2.13% of 47 decks 1 decks
Leinore, Autumn Sovereign
0.05% of 1933 decks 1 decks
Creatures
Pious Evangel
100% of 1 decks +100% synergy
Thalisse, Reverent Medium
100% of 1 decks +97% synergy
Teysa Karlov
100% of 1 decks +95% synergy
Chatterfang, Squirrel General
100% of 1 decks +95% synergy
Elas il-Kor, Sadistic Pilgrim
100% of 1 decks +88% synergy
Kutzil, Malamet Exemplar
100% of 1 decks +81% synergy
Liege of the Hollows
50% of 2 decks +50% synergy
Avatar of the Resolute
50% of 2 decks +50% synergy
Social Climber
50% of 2 decks +50% synergy
Kor Celebrant
50% of 2 decks +50% synergy
Healer of the Pride
50% of 2 decks +50% synergy
Crystalline Crawler
50% of 2 decks +50% synergy
Nut Collector
50% of 2 decks +50% synergy
Triskelion
50% of 2 decks +50% synergy
Squirrel Mob
50% of 2 decks +49% synergy
Elite Scaleguard
50% of 2 decks +49% synergy
Impassioned Orator
50% of 2 decks +49% synergy
Ochre Jelly
50% of 2 decks +49% synergy
Ainok Bond-Kin
50% of 2 decks +49% synergy
Distinguished Conjurer
50% of 2 decks +49% synergy
Lunarch Veteran
50% of 2 decks +49% synergy
Primordial Hydra
50% of 2 decks +49% synergy
Armorcraft Judge
50% of 2 decks +49% synergy
Benevolent Hydra
50% of 2 decks +48% synergy
Ivy Lane Denizen
50% of 2 decks +48% synergy
Duskshell Crawler
50% of 2 decks +48% synergy
Loyal Guardian
50% of 2 decks +48% synergy
Biophagus
50% of 2 decks +48% synergy
Mycoloth
50% of 2 decks +48% synergy
Verdant Sun's Avatar
50% of 2 decks +48% synergy
Guardian of Faith
50% of 2 decks +48% synergy
Daxos, Blessed by the Sun
50% of 2 decks +48% synergy
Trostani, Selesnya's Voice
50% of 2 decks +47% synergy
Essence Warden
50% of 2 decks +47% synergy
Prosperous Innkeeper
50% of 2 decks +47% synergy
Vigor
50% of 2 decks +47% synergy
Queen Allenal of Ruadach
50% of 2 decks +47% synergy
Rhys the Redeemed
50% of 2 decks +47% synergy
Ashaya, Soul of the Wild
50% of 2 decks +47% synergy
Soul's Attendant
50% of 2 decks +47% synergy
Suture Priest
50% of 2 decks +47% synergy
Augur of Autumn
50% of 2 decks +47% synergy
Gyre Sage
50% of 2 decks +46% synergy
Nyxbloom Ancient
50% of 2 decks +46% synergy
Managorger Hydra
50% of 2 decks +46% synergy
Defiler of Vigor
50% of 2 decks +46% synergy
Conclave Mentor
50% of 2 decks +46% synergy
Incubation Druid
50% of 2 decks +45% synergy
Soul Warden
50% of 2 decks +45% synergy
Jaheira, Friend of the Forest
50% of 2 decks +45% synergy
Instants
Stroke of Midnight
100% of 1 decks +88% synergy
Kabira Takedown
50% of 2 decks +48% synergy
Sejiri Shelter
50% of 2 decks +46% synergy
Clever Concealment
50% of 2 decks +45% synergy
Inspiring Call
50% of 2 decks +42% synergy
Nature's Claim
50% of 2 decks +40% synergy
Return of the Wildspeaker
50% of 2 decks +37% synergy
Generous Gift
50% of 2 decks +24% synergy
Heroic Intervention
50% of 2 decks +20% synergy
Beast Within
50% of 2 decks +11% synergy
Path to Exile
50% of 2 decks +5% synergy
Swords to Plowshares
50% of 2 decks -13% synergy
Sorceries
Chatterstorm
50% of 2 decks +49% synergy
Council's Judgment
50% of 2 decks +49% synergy
Damning Verdict
50% of 2 decks +48% synergy
Shamanic Revelation
50% of 2 decks +41% synergy
Austere Command
50% of 2 decks +37% synergy
Utility Artifacts
Andúril, Narsil Reforged
100% of 1 decks +99% synergy
Orochi Hatchery
50% of 2 decks +50% synergy
Blasting Station
50% of 2 decks +49% synergy
Mycosynth Lattice
50% of 2 decks +49% synergy
Clock of Omens
50% of 2 decks +49% synergy
Contagion Engine
50% of 2 decks +49% synergy
Contagion Clasp
50% of 2 decks +49% synergy
Thousand-Year Elixir
50% of 2 decks +48% synergy
Isochron Scepter
50% of 2 decks +48% synergy
Helm of the Host
50% of 2 decks +47% synergy
Ozolith, the Shattered Spire
50% of 2 decks +44% synergy
Lightning Greaves
50% of 2 decks +25% synergy
Enchantments
Conspiracy
100% of 1 decks +99% synergy
Branching Evolution
100% of 2 decks +95% synergy
Cloakwood Hermit
50% of 2 decks +49% synergy
Dictate of Karametra
50% of 2 decks +49% synergy
Earthcraft
50% of 2 decks +49% synergy
Heartbeat of Spring
50% of 2 decks +49% synergy
Squirrel Nest
50% of 2 decks +49% synergy
Resourceful Defense
50% of 2 decks +49% synergy
Leyline of Abundance
50% of 2 decks +49% synergy
Mana Reflection
50% of 2 decks +48% synergy
Song of the Dryads
50% of 2 decks +48% synergy
Growing Ranks
50% of 2 decks +48% synergy
Zendikar Resurgent
50% of 2 decks +47% synergy
Primal Vigor
50% of 2 decks +47% synergy
Darksteel Mutation
50% of 2 decks +44% synergy
Felidar Retreat
50% of 2 decks +43% synergy
Parallel Lives
50% of 2 decks +43% synergy
Tribute to the World Tree
50% of 2 decks +42% synergy
Hardened Scales
50% of 2 decks +41% synergy
Anointed Procession
50% of 2 decks +41% synergy
Sylvan Library
50% of 2 decks +38% synergy
Mirari's Wake
50% of 2 decks +36% synergy
Utility Lands
Ghost Quarter
50% of 2 decks +48% synergy
Karn's Bastion
50% of 2 decks +45% synergy
Yavimaya, Cradle of Growth
50% of 2 decks +41% synergy
Temple of the False God
50% of 2 decks +40% synergy
Urborg, Tomb of Yawgmoth
50% of 2 decks +40% synergy
Rogue's Passage
50% of 2 decks +31% synergy
Mana Artifacts
Sol Ring
100% of 2 decks +16% synergy
Astral Cornucopia
50% of 2 decks +49% synergy
Everflowing Chalice
50% of 2 decks +45% synergy
Lands
Snowfield Sinkhole
100% of 1 decks +97% synergy
Woodland Chasm
100% of 1 decks +95% synergy
Shattered Sanctum
100% of 1 decks +87% synergy
Deathcap Glade
100% of 1 decks +86% synergy
Overgrown Farmland
100% of 2 decks +84% synergy
Bountiful Promenade
100% of 2 decks +76% synergy
Sandsteppe Citadel
100% of 1 decks +74% synergy
Vault of Champions
100% of 1 decks +74% synergy
Isolated Chapel
100% of 1 decks +73% synergy
Woodland Cemetery
100% of 1 decks +72% synergy
Indatha Triome
100% of 1 decks +69% synergy
Canopy Vista
100% of 2 decks +64% synergy
Temple Garden
100% of 2 decks +59% synergy
Godless Shrine
100% of 1 decks +59% synergy
Overgrown Tomb
100% of 1 decks +57% synergy
Command Tower
100% of 2 decks +26% synergy
Arctic Treeline
50% of 2 decks +46% synergy
Wooded Bastion
50% of 2 decks +46% synergy
Branchloft Pathway
50% of 2 decks +42% synergy
Sungrass Prairie
50% of 2 decks +38% synergy
Fortified Village
50% of 2 decks +35% synergy
Brushland
50% of 2 decks +34% synergy
Sunpetal Grove
50% of 2 decks +27% synergy
Exotic Orchard
50% of 2 decks +14% synergy