Agatha's Soul Cauldron + Walking Ballista + Pyreheart Wolf

Agatha's Soul Cauldron
Walking Ballista
Pyreheart Wolf

Requires
Agatha's Soul Cauldron must be on the battlefield. Walking Ballista must be in exile (exiled by Agatha's Soul Cauldron). Pyreheart Wolf must be on the battlefield. Pyreheart Wolf has at least one +1/+1 counter on it.
Steps
  1. Activate Pyreheart Wolf using Walking Ballista's second ability by removing a +1/+1 counter from it.
  2. Repeat step 1 until Pyreheart Wolf has no +1/+1 counters on it.
  3. Resolve all Pyreheart Wolf abilities dealing 1 damage to Pyreheart Wolf, and any remaining damage to any target(s).
  4. Pyreheart Wolf dies as a state-based action due to having 0 toughness.
  5. Pyreheart Wolf's undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  6. Repeat.
Results
Infinite death triggers. Infinite ETB. Infinite LTB.

Voja, Jaws of the Conclave
0.01% of 11503 decks 1 decks
Birgi, God of Storytelling
0.06% of 1710 decks 1 decks
Creatures
Skyshroud Elf
100% of 1 decks +100% synergy
Viridian Joiner
100% of 1 decks +99% synergy
Joraga Warcaller
100% of 1 decks +99% synergy
Elvish Harbinger
100% of 1 decks +99% synergy
Elvish Champion
100% of 1 decks +99% synergy
Ezuri, Renegade Leader
100% of 1 decks +98% synergy
Boreal Druid
100% of 1 decks +98% synergy
Druid of the Anima
100% of 1 decks +98% synergy
Leaf-Crowned Visionary
100% of 1 decks +98% synergy
Grand Warlord Radha
100% of 1 decks +98% synergy
Moon-Blessed Cleric
100% of 1 decks +98% synergy
Quirion Ranger
100% of 1 decks +98% synergy
Elvish Warmaster
100% of 1 decks +98% synergy
Masked Vandal
100% of 1 decks +97% synergy
Marwyn, the Nurturer
100% of 1 decks +97% synergy
Arwen, Weaver of Hope
100% of 1 decks +97% synergy
Devoted Druid
100% of 1 decks +97% synergy
Elvish Spirit Guide
100% of 1 decks +97% synergy
Elvish Archdruid
100% of 1 decks +96% synergy
Gyre Sage
100% of 1 decks +96% synergy
Circle of Dreams Druid
100% of 1 decks +96% synergy
Priest of Titania
100% of 1 decks +96% synergy
Shalai and Hallar
100% of 1 decks +96% synergy
Mirror Entity
100% of 1 decks +95% synergy
Evolution Witness
100% of 1 decks +95% synergy
Selvala, Heart of the Wilds
100% of 1 decks +95% synergy
Realmwalker
100% of 1 decks +94% synergy
Disciple of Freyalise
100% of 1 decks +93% synergy
Kami of Whispered Hopes
100% of 1 decks +92% synergy
Bloom Tender
100% of 1 decks +92% synergy
Roaming Throne
100% of 1 decks +90% synergy
Reclamation Sage
100% of 1 decks +89% synergy
Beast Whisperer
100% of 1 decks +88% synergy
Fyndhorn Elves
100% of 1 decks +87% synergy
Elvish Mystic
100% of 1 decks +82% synergy
Kutzil, Malamet Exemplar
100% of 1 decks +81% synergy
Esper Sentinel
100% of 1 decks +79% synergy
Llanowar Elves
100% of 1 decks +79% synergy
War Elemental
50% of 2 decks +50% synergy
Burning Prophet
50% of 2 decks +50% synergy
Flamekin Harbinger
50% of 2 decks +50% synergy
Grinning Ignus
50% of 2 decks +49% synergy
Rograkh, Son of Rohgahh
50% of 2 decks +49% synergy
Treasonous Ogre
50% of 2 decks +48% synergy
Zealous Conscripts
50% of 2 decks +48% synergy
Krenko, Mob Boss
50% of 2 decks +48% synergy
Runaway Steam-Kin
50% of 2 decks +48% synergy
Skirk Prospector
50% of 2 decks +47% synergy
Firebrand Archer
50% of 2 decks +47% synergy
Combat Celebrant
50% of 2 decks +47% synergy
Instants
Mercy Killing
100% of 1 decks +100% synergy
Windswift Slice
100% of 1 decks +99% synergy
Legolas's Quick Reflexes
100% of 1 decks +97% synergy
Clever Concealment
100% of 1 decks +95% synergy
Archdruid's Charm
100% of 1 decks +93% synergy
Inspiring Call
100% of 1 decks +92% synergy
Flawless Maneuver
100% of 1 decks +90% synergy
Enlightened Tutor
100% of 1 decks +82% synergy
Path to Exile
100% of 1 decks +55% synergy
Swords to Plowshares
100% of 1 decks +37% synergy
Storm King's Thunder
50% of 2 decks +49% synergy
Gut Shot
50% of 2 decks +49% synergy
Crimson Wisps
50% of 2 decks +49% synergy
Desperate Ritual
50% of 2 decks +48% synergy
Pyretic Ritual
50% of 2 decks +47% synergy
Reverberate
50% of 2 decks +47% synergy
Expedite
50% of 2 decks +47% synergy
Tibalt's Trickery
50% of 2 decks +44% synergy
Seething Song
50% of 2 decks +44% synergy
Pyroblast
50% of 2 decks +44% synergy
Red Elemental Blast
50% of 2 decks +43% synergy
Thrill of Possibility
50% of 2 decks +40% synergy
Lightning Bolt
50% of 2 decks +39% synergy
Abrade
50% of 2 decks +39% synergy
Deflecting Swat
50% of 2 decks +34% synergy
Chaos Warp
50% of 2 decks +18% synergy
Sorceries
Damning Verdict
100% of 1 decks +98% synergy
Last March of the Ents
100% of 1 decks +95% synergy
Shamanic Revelation
100% of 1 decks +91% synergy
Rishkar's Expertise
100% of 1 decks +90% synergy
Warlord's Fury
50% of 2 decks +49% synergy
Overmaster
50% of 2 decks +49% synergy
Winds of Change
50% of 2 decks +49% synergy
Crash Through
50% of 2 decks +48% synergy
Crackle with Power
50% of 2 decks +48% synergy
Rite of Flame
50% of 2 decks +47% synergy
Grapeshot
50% of 2 decks +46% synergy
Gamble
50% of 2 decks +40% synergy
Jeska's Will
50% of 2 decks +32% synergy
Blasphemous Act
50% of 2 decks +16% synergy
Utility Artifacts
The Great Henge
100% of 1 decks +90% synergy
Staff of the Flame Magus
50% of 2 decks +50% synergy
Thornbite Staff
50% of 2 decks +49% synergy
Helm of Awakening
50% of 2 decks +49% synergy
Umbral Mantle
50% of 2 decks +49% synergy
Staff of Domination
50% of 2 decks +48% synergy
Ruby Medallion
50% of 2 decks +47% synergy
Maskwood Nexus
50% of 2 decks +47% synergy
Aetherflux Reservoir
50% of 2 decks +46% synergy
Sensei's Divining Top
50% of 2 decks +44% synergy
Ashnod's Altar
50% of 2 decks +42% synergy
The One Ring
50% of 2 decks +41% synergy
Lightning Greaves
50% of 2 decks +25% synergy
Swiftfoot Boots
50% of 2 decks +22% synergy
Enchantments
Concordant Crossroads
100% of 1 decks +97% synergy
Branching Evolution
100% of 1 decks +95% synergy
Guardian Project
100% of 1 decks +91% synergy
Sylvan Library
100% of 1 decks +88% synergy
Annie Joins Up
100% of 1 decks +81% synergy
Mass Hysteria
50% of 2 decks +49% synergy
Blood Moon
50% of 2 decks +47% synergy
All Will Be One
50% of 2 decks +47% synergy
Aggravated Assault
50% of 2 decks +47% synergy
Underworld Breach
50% of 2 decks +44% synergy
Impact Tremors
50% of 2 decks +41% synergy
Utility Lands
Gaea's Cradle
100% of 1 decks +94% synergy
Minas Tirith
100% of 1 decks +91% synergy
Three Tree City
100% of 1 decks +90% synergy
Boseiju, Who Endures
100% of 1 decks +80% synergy
Valakut, the Molten Pinnacle
50% of 2 decks +48% synergy
Yavimaya, Cradle of Growth
50% of 2 decks +41% synergy
Ancient Tomb
50% of 2 decks +39% synergy
Reliquary Tower
50% of 2 decks +21% synergy
Mana Artifacts
Sol Ring
100% of 2 decks +16% synergy
Mox Diamond
50% of 2 decks +46% synergy
Mox Opal
50% of 2 decks +46% synergy
Jeweled Lotus
50% of 2 decks +44% synergy
Mana Vault
50% of 2 decks +44% synergy
Lotus Petal
50% of 2 decks +43% synergy
Mana Crypt
50% of 2 decks +41% synergy
Arcane Signet
50% of 2 decks -22% synergy
Lands
Plateau
100% of 1 decks +87% synergy
Savannah
100% of 1 decks +87% synergy
Taiga
100% of 1 decks +87% synergy
Sundown Pass
100% of 1 decks +85% synergy
Overgrown Farmland
100% of 1 decks +84% synergy
Rockfall Vale
100% of 1 decks +78% synergy
Bountiful Promenade
100% of 1 decks +76% synergy
Spire Garden
100% of 1 decks +76% synergy
Spectator Seating
100% of 1 decks +75% synergy
Sacred Foundry
100% of 1 decks +64% synergy
Temple Garden
100% of 1 decks +59% synergy
Stomping Ground
100% of 1 decks +59% synergy
Gemstone Caverns
50% of 2 decks +45% synergy
Cavern of Souls
50% of 2 decks +43% synergy
Wooded Foothills
50% of 2 decks +40% synergy
Windswept Heath
50% of 2 decks +40% synergy
Arid Mesa
50% of 2 decks +39% synergy
Command Tower
50% of 2 decks -24% synergy