Mairsil, the Pretender + Carnifex Demon + Cauldron of Souls + Blood Pet + Thousand-Year Elixir

Mairsil, the Pretender
Carnifex Demon
Cauldron of Souls
Blood Pet
Thousand-Year Elixir

Requires
Mairsil, the Pretender must be on the battlefield. Carnifex Demon must be in exile. Cauldron of Souls must be in exile. Blood Pet must be in exile. Thousand-Year Elixir must be on the battlefield. Mairsil does not have a -1/-1 counter on it.
Steps
  1. Activate Mairsil using Cauldron of Souls' ability by tapping it, giving itself persist until end of turn.
  2. Activate Mairsil using Blood Pet's ability by sacrificing it, adding .
  3. When Mairsil dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
  4. Activate Mairsil using Carnifex Demon's ability by paying and removing a -1/-1 counter from it, putting a -1/-1 counter on each other creature.
  5. Repeat.
Results
Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

Mairsil, the Pretender
0.13% of 1576 decks 2 decks
Creatures
Triskelavus
100% of 2 decks +100% synergy
Blood Vassal
100% of 2 decks +100% synergy
Sage of Hours
100% of 2 decks +100% synergy
Anthroplasm
100% of 2 decks +100% synergy
Arco-Flagellant
100% of 1 decks +100% synergy
Spikeshot Elder
100% of 2 decks +100% synergy
Ulamog's Dreadsire
100% of 1 decks +100% synergy
Morphling
100% of 2 decks +100% synergy
Triskelion
100% of 2 decks +100% synergy
Horseshoe Crab
100% of 2 decks +100% synergy
Hateflayer
100% of 2 decks +100% synergy
Deathbringer Thoctar
100% of 2 decks +100% synergy
Quicksilver Elemental
100% of 2 decks +100% synergy
Endling
100% of 2 decks +100% synergy
Tree of Perdition
100% of 2 decks +99% synergy
Asmodeus the Archfiend
100% of 2 decks +99% synergy
Walking Ballista
100% of 2 decks +99% synergy
Kitsa, Otterball Elite
100% of 1 decks +99% synergy
Pack Rat
100% of 2 decks +98% synergy
Likeness Looter
100% of 1 decks +98% synergy
Lunar Avenger
50% of 2 decks +50% synergy
Cryptic Trilobite
50% of 2 decks +50% synergy
Overeager Apprentice
50% of 2 decks +50% synergy
Workhorse
50% of 2 decks +50% synergy
Skyship Stalker
50% of 2 decks +50% synergy
Cinderhaze Wretch
50% of 2 decks +50% synergy
Magus of the Bazaar
50% of 2 decks +50% synergy
Blighted Bat
50% of 2 decks +50% synergy
Grinning Ignus
50% of 2 decks +50% synergy
Kozilek, the Great Distortion
50% of 2 decks +50% synergy
Crystalline Crawler
50% of 2 decks +50% synergy
Soliton
50% of 2 decks +50% synergy
Argent Sphinx
50% of 2 decks +50% synergy
Ovinomancer
50% of 2 decks +50% synergy
Cephalid Inkshrouder
50% of 2 decks +50% synergy
Mirror-Mad Phantasm
50% of 2 decks +50% synergy
Merfolk Looter
50% of 2 decks +50% synergy
Eater of the Dead
50% of 2 decks +50% synergy
Shauku, Endbringer
50% of 2 decks +50% synergy
Avatar of Woe
50% of 2 decks +50% synergy
Cavern Harpy
50% of 2 decks +50% synergy
Torchling
50% of 2 decks +49% synergy
Mercurial Chemister
50% of 2 decks +49% synergy
Aetherling
50% of 2 decks +49% synergy
Oriq Loremage
50% of 2 decks +49% synergy
Doom Whisperer
50% of 2 decks +49% synergy
Galecaster Colossus
50% of 2 decks +49% synergy
Goro-Goro, Disciple of Ryusei
50% of 2 decks +48% synergy
Urabrask the Hidden
50% of 2 decks +48% synergy
Deadeye Navigator
50% of 2 decks +48% synergy
Instants
Forbid
50% of 2 decks +50% synergy
Remand
50% of 2 decks +50% synergy
Saw It Coming
50% of 2 decks +49% synergy
Ghostly Flicker
50% of 2 decks +43% synergy
Mana Drain
50% of 2 decks +34% synergy
Negate
50% of 2 decks +26% synergy
Counterspell
50% of 2 decks +5% synergy
Sorceries
Grim Tutor
50% of 2 decks +45% synergy
Diabolic Tutor
50% of 2 decks +44% synergy
Gamble
50% of 2 decks +40% synergy
Demonic Tutor
50% of 2 decks +26% synergy
Utility Artifacts
Magistrate's Scepter
100% of 2 decks +100% synergy
Staff of Domination
100% of 2 decks +99% synergy
Collector's Vault
100% of 1 decks +99% synergy
Nevinyrral's Disk
100% of 2 decks +99% synergy
Agatha's Soul Cauldron
100% of 1 decks +98% synergy
The One Ring
100% of 1 decks +85% synergy
Ring of Three Wishes
50% of 2 decks +50% synergy
Heartstone
50% of 2 decks +50% synergy
Pendant of Prosperity
50% of 2 decks +49% synergy
Crystal Shard
50% of 2 decks +49% synergy
Conjurer's Closet
50% of 2 decks +47% synergy
Phyrexian Altar
50% of 2 decks +46% synergy
Wayfarer's Bauble
50% of 2 decks +32% synergy
Enchantments
Mass Hysteria
50% of 2 decks +50% synergy
Freed from the Real
50% of 2 decks +49% synergy
Training Grounds
50% of 2 decks +49% synergy
Fervor
50% of 2 decks +49% synergy
Sneak Attack
50% of 2 decks +44% synergy
Planeswalkers
Jace, Wielder of Mysteries
50% of 2 decks +49% synergy
Mana Artifacts
Ventifact Bottle
100% of 2 decks +100% synergy
Gilded Lotus
100% of 2 decks +96% synergy
Nyx Lotus
50% of 2 decks +50% synergy
Fellwar Stone
50% of 2 decks +15% synergy
Izzet Signet
50% of 2 decks +10% synergy
Talisman of Indulgence
50% of 2 decks +10% synergy
Rakdos Signet
50% of 2 decks +8% synergy
Dimir Signet
50% of 2 decks +6% synergy
Talisman of Creativity
50% of 2 decks +5% synergy
Talisman of Dominance
50% of 2 decks +3% synergy
Arcane Signet
50% of 2 decks -38% synergy
Sol Ring
50% of 2 decks -41% synergy