Mairsil, the Pretender + Blood Vassal + Endling + Workhorse

Mairsil, the Pretender
Blood Vassal
Endling
Workhorse

Requires
Mairsil, the Pretender must be on the battlefield. Blood Vassal must be in exile. Endling must be in exile. Workhorse must be in exile. Mairsil does not have a +1/+1 counter on it. Mana needed:
Steps
  1. Activate Mairsil using Endling's third ability by paying , giving Mairsil undying until end of turn.
  2. Activate Mairsil using Blood Vassal's ability by sacrificing it, adding .
  3. Mairsil dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  4. Activate Mairsil using Workhorse's ability by removing a +1/+1 counter from it, adding .
  5. Repeat.
Results
Infinite black mana. Infinite colorless mana. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

Mairsil, the Pretender
0.13% of 1576 decks 2 decks
Creatures
Lunar Avenger
100% of 2 decks +100% synergy
Cinderhaze Wretch
100% of 2 decks +100% synergy
Sage of Hours
100% of 2 decks +100% synergy
Anthroplasm
100% of 2 decks +100% synergy
Transplant Theorist
100% of 1 decks +100% synergy
Grinning Ignus
100% of 2 decks +100% synergy
Crystalline Crawler
100% of 2 decks +100% synergy
Unctus, Grand Metatect
100% of 1 decks +100% synergy
Mirror-Mad Phantasm
100% of 2 decks +100% synergy
Blood Pet
100% of 2 decks +100% synergy
Drafna, Founder of Lat-Nam
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
Deathbringer Thoctar
100% of 2 decks +100% synergy
Quicksilver Elemental
100% of 2 decks +100% synergy
Omen Hawker
100% of 1 decks +99% synergy
Asmodeus the Archfiend
100% of 2 decks +99% synergy
Aetherling
100% of 2 decks +99% synergy
Urabrask the Hidden
100% of 2 decks +98% synergy
Likeness Looter
100% of 1 decks +98% synergy
Thassa, Deep-Dwelling
100% of 2 decks +97% synergy
Anger
100% of 2 decks +91% synergy
Blind Seer
50% of 2 decks +50% synergy
Triskelavus
50% of 2 decks +50% synergy
Cryptic Trilobite
50% of 2 decks +50% synergy
Overeager Apprentice
50% of 2 decks +50% synergy
Carnifex Demon
50% of 2 decks +50% synergy
Kurkesh, Onakke Ancient
50% of 2 decks +50% synergy
Grand Architect
50% of 2 decks +50% synergy
Spikeshot Elder
50% of 2 decks +50% synergy
Aphetto Alchemist
50% of 2 decks +50% synergy
Skirge Familiar
50% of 2 decks +50% synergy
Palladium Myr
50% of 2 decks +50% synergy
Pili-Pala
50% of 2 decks +50% synergy
Hateflayer
50% of 2 decks +50% synergy
Tree of Perdition
50% of 2 decks +49% synergy
Walking Ballista
50% of 2 decks +49% synergy
Duskmantle Guildmage
50% of 2 decks +49% synergy
Fatestitcher
50% of 2 decks +49% synergy
Jhoira's Familiar
50% of 2 decks +49% synergy
Goro-Goro, Disciple of Ryusei
50% of 2 decks +48% synergy
Arcanis the Omnipotent
50% of 2 decks +48% synergy
Deadeye Navigator
50% of 2 decks +48% synergy
Pack Rat
50% of 2 decks +48% synergy
Imperial Recruiter
50% of 2 decks +47% synergy
Master Transmuter
50% of 2 decks +47% synergy
Displacer Kitten
50% of 2 decks +46% synergy
Jace's Archivist
50% of 2 decks +43% synergy
Thassa's Oracle
50% of 2 decks +42% synergy
Instants
Ghostly Flicker
100% of 2 decks +93% synergy
Argent Mutation
50% of 2 decks +50% synergy
Forbid
50% of 2 decks +50% synergy
Remand
50% of 2 decks +50% synergy
Illusionist's Stratagem
50% of 2 decks +49% synergy
Saw It Coming
50% of 2 decks +49% synergy
Blur
50% of 2 decks +49% synergy
Dramatic Reversal
50% of 2 decks +48% synergy
Displace
50% of 2 decks +47% synergy
Essence Flux
50% of 2 decks +47% 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
Heartstone
100% of 2 decks +100% synergy
Sting, the Glinting Dagger
100% of 1 decks +100% synergy
Staff of Domination
100% of 2 decks +99% synergy
Encroaching Mycosynth
100% of 1 decks +99% synergy
Conjurer's Closet
100% of 2 decks +97% synergy
Thran Forge
50% of 2 decks +50% synergy
Ashnod's Transmogrant
50% of 2 decks +50% synergy
Ring of Three Wishes
50% of 2 decks +50% synergy
Cauldron of Souls
50% of 2 decks +50% synergy
Liquimetal Coating
50% of 2 decks +50% synergy
Battlemage's Bracers
50% of 2 decks +50% synergy
Illusionist's Bracers
50% of 2 decks +49% synergy
Thousand-Year Elixir
50% of 2 decks +49% synergy
Rings of Brighthearth
50% of 2 decks +49% synergy
Nevinyrral's Disk
50% of 2 decks +49% synergy
Unwinding Clock
50% of 2 decks +48% synergy
Time Sieve
50% of 2 decks +48% synergy
Mindcrank
50% of 2 decks +48% synergy
Phyrexian Altar
50% of 2 decks +46% synergy
Lithoform Engine
50% of 2 decks +46% synergy
Enchantments
Roar of Resistance
100% of 1 decks +100% synergy
Training Grounds
100% of 2 decks +99% synergy
Rising of the Day
100% of 1 decks +95% synergy
Mass Hysteria
50% of 2 decks +50% synergy
Freed from the Real
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
Utility Lands
Command Beacon
50% of 2 decks +45% synergy
Vault of Whispers
50% of 2 decks +44% synergy
Great Furnace
50% of 2 decks +44% synergy
Seat of the Synod
50% of 2 decks +44% 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
Liquimetal Torque
50% of 2 decks +47% synergy