Mairsil, the Pretender + Carnifex Demon + Cauldron of Souls + Blood Vassal + Fervor

Mairsil, the Pretender
Carnifex Demon
Cauldron of Souls
Blood Vassal
Fervor

Requires
Mairsil, the Pretender must be on the battlefield. Carnifex Demon must be in exile. Cauldron of Souls must be in exile. Blood Vassal must be in exile. Fervor 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 Vassal'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 black mana. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

Mairsil, the Pretender
0.06% of 1568 decks 1 decks
Creatures
Lunar Avenger
100% of 1 decks +100% synergy
Triskelavus
100% of 1 decks +100% synergy
Overeager Apprentice
100% of 1 decks +100% synergy
Cryptic Trilobite
100% of 1 decks +100% synergy
Workhorse
100% of 1 decks +100% synergy
Cinderhaze Wretch
100% of 1 decks +100% synergy
Sage of Hours
100% of 1 decks +100% synergy
Anthroplasm
100% of 1 decks +100% synergy
Grinning Ignus
100% of 1 decks +100% synergy
Spikeshot Elder
100% of 1 decks +100% synergy
Crystalline Crawler
100% of 1 decks +100% synergy
Mirror-Mad Phantasm
100% of 1 decks +100% synergy
Blood Pet
100% of 1 decks +100% synergy
Morphling
100% of 1 decks +100% synergy
Triskelion
100% of 1 decks +100% synergy
Horseshoe Crab
100% of 1 decks +100% synergy
Hateflayer
100% of 1 decks +100% synergy
Quicksilver Elemental
100% of 1 decks +100% synergy
Deathbringer Thoctar
100% of 1 decks +100% synergy
Endling
100% of 1 decks +100% synergy
Tree of Perdition
100% of 1 decks +99% synergy
Asmodeus the Archfiend
100% of 1 decks +99% synergy
Aetherling
100% of 1 decks +99% synergy
Walking Ballista
100% of 1 decks +99% synergy
Deadeye Navigator
100% of 1 decks +98% synergy
Urabrask the Hidden
100% of 1 decks +98% synergy
Pack Rat
100% of 1 decks +98% synergy
Imperial Recruiter
100% of 1 decks +97% synergy
Thassa, Deep-Dwelling
100% of 1 decks +97% synergy
Displacer Kitten
100% of 1 decks +96% synergy
Thassa's Oracle
100% of 1 decks +92% synergy
Anger
100% of 1 decks +90% synergy
Instants
Forbid
100% of 1 decks +100% synergy
Remand
100% of 1 decks +100% synergy
Saw It Coming
100% of 1 decks +99% synergy
Ghostly Flicker
100% of 1 decks +94% synergy
Mana Drain
100% of 1 decks +84% synergy
Negate
100% of 1 decks +76% synergy
Counterspell
100% of 1 decks +55% synergy
Sorceries
Grim Tutor
100% of 1 decks +95% synergy
Diabolic Tutor
100% of 1 decks +94% synergy
Gamble
100% of 1 decks +91% synergy
Demonic Tutor
100% of 1 decks +76% synergy
Utility Artifacts
Magistrate's Scepter
100% of 1 decks +100% synergy
Ring of Three Wishes
100% of 1 decks +100% synergy
Heartstone
100% of 1 decks +100% synergy
Staff of Domination
100% of 1 decks +99% synergy
Thousand-Year Elixir
100% of 1 decks +99% synergy
Nevinyrral's Disk
100% of 1 decks +99% synergy
Conjurer's Closet
100% of 1 decks +97% synergy
Phyrexian Altar
100% of 1 decks +96% synergy
Enchantments
Mass Hysteria
100% of 1 decks +100% synergy
Freed from the Real
100% of 1 decks +99% synergy
Training Grounds
100% of 1 decks +99% synergy
Sneak Attack
100% of 1 decks +94% synergy
Planeswalkers
Jace, Wielder of Mysteries
100% of 1 decks +99% synergy
Mana Artifacts
Ventifact Bottle
100% of 1 decks +100% synergy
Nyx Lotus
100% of 1 decks +100% synergy
Gilded Lotus
100% of 1 decks +96% synergy