Hell's Caretaker + Corridor Monitor + Deceiver Exarch

Hell's Caretaker
Corridor Monitor
Deceiver Exarch

Requires
Hell's Caretaker must be on the battlefield. Corridor Monitor must be on the battlefield. Deceiver Exarch must be in the graveyard.
Steps
  1. During your upkeep, activate Hell's Caretaker by sacrificing Corridor Montior, returning Deceiver Exarch from your graveyard to the battlefield.
  2. Deceiver Exarch enters the battlefield, untapping Hell's Caretaker.
  3. Activate Hell's Caretaker by sacrificing Deceiver Exarch, returning Corridor Monitor from your graveyard to the battlefield.
  4. Corridor Monitor enters the battlefield, untapping Hell's Caretaker.
  5. Repeat.
Results
Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

Ashnod the Uncaring
0.07% of 2695 decks 2 decks
Araumi of the Dead Tide
0.03% of 3323 decks 1 decks
Creatures
Bjorna, Nightfall Alchemist
100% of 2 decks +100% synergy
Farid, Enterprising Salvager
100% of 2 decks +100% synergy
Scrap Welder
100% of 2 decks +100% synergy
Transplant Theorist
100% of 2 decks +100% synergy
Hidetsugu, Devouring Chaos
100% of 2 decks +99% synergy
Stormclaw Rager
100% of 2 decks +99% synergy
Siege-Gang Commander
100% of 2 decks +98% synergy
Jhoira, Weatherlight Captain
100% of 2 decks +94% synergy
Callous Oppressor
67% of 3 decks +67% synergy
Sadistic Hypnotist
67% of 3 decks +66% synergy
Herald of Anguish
67% of 3 decks +66% synergy
Sivriss, Nightmare Speaker
67% of 3 decks +66% synergy
Man-o'-War
67% of 3 decks +66% synergy
Ruthless Knave
67% of 3 decks +66% synergy
Keiga, the Tide Star
67% of 3 decks +66% synergy
Whisper, Blood Liturgist
67% of 3 decks +66% synergy
Oriq Loremage
67% of 3 decks +66% synergy
Doomed Necromancer
67% of 3 decks +65% synergy
Fain, the Broker
67% of 3 decks +65% synergy
Thought Monitor
67% of 3 decks +64% synergy
Noxious Gearhulk
67% of 3 decks +63% synergy
Peregrine Drake
67% of 3 decks +63% synergy
Sai, Master Thopterist
67% of 3 decks +63% synergy
Emry, Lurker of the Loch
67% of 3 decks +63% synergy
Burnished Hart
67% of 3 decks +62% synergy
Zulaport Cutthroat
67% of 3 decks +57% synergy
Chainer, Nightmare Adept
50% of 2 decks +45% synergy
Merfolk Skyscout
33% of 3 decks +33% synergy
Ashen-Skin Zubera
33% of 3 decks +33% synergy
Floating-Dream Zubera
33% of 3 decks +33% synergy
Inga Rune-Eyes
33% of 3 decks +33% synergy
Phyrexian Plaguelord
33% of 3 decks +33% synergy
Malakir Blood-Priest
33% of 3 decks +33% synergy
Scion of Darkness
33% of 3 decks +33% synergy
Sanguine Spy
33% of 3 decks +33% synergy
Pestermite
33% of 3 decks +33% synergy
Champion of Wits
33% of 3 decks +33% synergy
Fatestitcher
33% of 3 decks +33% synergy
Nimble Obstructionist
33% of 3 decks +33% synergy
Dimir House Guard
33% of 3 decks +33% synergy
Undead Butler
33% of 3 decks +32% synergy
Graveshifter
33% of 3 decks +32% synergy
Vizier of Tumbling Sands
33% of 3 decks +32% synergy
Phyrexian Delver
33% of 3 decks +32% synergy
Archfiend of Ifnir
33% of 3 decks +32% synergy
Cloud of Faeries
33% of 3 decks +32% synergy
Grave Titan
33% of 3 decks +31% synergy
Massacre Girl
33% of 3 decks +31% synergy
Falkenrath Noble
33% of 3 decks +31% synergy
Disciple of Bolas
33% of 3 decks +31% synergy
Instants
Thirst for Knowledge
100% of 3 decks +98% synergy
Frantic Search
100% of 3 decks +88% synergy
Bedevil
100% of 2 decks +86% synergy
Chaos Warp
100% of 2 decks +68% synergy
Mana Leak
67% of 3 decks +64% synergy
Soul Shatter
67% of 3 decks +64% synergy
Snap
67% of 3 decks +60% synergy
Arcane Denial
67% of 3 decks +47% synergy
Insidious Dreams
33% of 3 decks +33% synergy
Commander's Insight
33% of 3 decks +33% synergy
Engulf the Shore
33% of 3 decks +32% synergy
Hostile Negotiations
33% of 3 decks +32% synergy
Perplex
33% of 3 decks +32% synergy
Thirst for Discovery
33% of 3 decks +32% synergy
Narset's Reversal
33% of 3 decks +30% synergy
Muddle the Mixture
33% of 3 decks +28% synergy
Fact or Fiction
33% of 3 decks +27% synergy
Mana Drain
33% of 3 decks +18% synergy
Negate
33% of 3 decks +11% synergy
Counterspell
33% of 3 decks -10% synergy
Sorceries
Buried Alive
100% of 3 decks +94% synergy
Terisiare's Devastation
67% of 3 decks +66% synergy
Thoughtcast
67% of 3 decks +63% synergy
Feed the Swarm
67% of 3 decks +49% synergy
Syphon Mind
33% of 3 decks +30% synergy
Dread Return
33% of 3 decks +28% synergy
Diabolic Intent
33% of 3 decks +25% synergy
Windfall
33% of 3 decks +20% synergy
Reanimate
33% of 3 decks +18% synergy
Utility Artifacts
Pyrite Spellbomb
100% of 2 decks +100% synergy
Dragonspark Reactor
100% of 2 decks +100% synergy
Jester's Cap
67% of 3 decks +67% synergy
Necrogen Spellbomb
67% of 3 decks +67% synergy
Mnemonic Sphere
67% of 3 decks +66% synergy
Liquimetal Coating
67% of 3 decks +66% synergy
Executioner's Capsule
67% of 3 decks +66% synergy
Genesis Chamber
67% of 3 decks +66% synergy
Nihil Spellbomb
67% of 3 decks +66% synergy
Trading Post
67% of 3 decks +65% synergy
Aether Spellbomb
67% of 3 decks +65% synergy
Wayfarer's Bauble
67% of 3 decks +57% synergy
Convergence of Dominion
33% of 3 decks +33% synergy
Pact Weapon
33% of 3 decks +33% synergy
Rings of Brighthearth
33% of 3 decks +32% synergy
Crucible of Worlds
33% of 3 decks +31% synergy
Hedron Archive
33% of 3 decks +30% synergy
Ashnod's Altar
33% of 3 decks +26% synergy
Lightning Greaves
33% of 3 decks +8% synergy
Enchantments
Clan Crafter
67% of 3 decks +66% synergy
Thopter Spy Network
67% of 3 decks +63% synergy
Teferi's Veil
33% of 3 decks +33% synergy
No Mercy
33% of 3 decks +31% synergy
Utility Lands
Great Furnace
100% of 2 decks +94% synergy
Mishra's Factory
67% of 3 decks +66% synergy
Darksteel Citadel
67% of 3 decks +63% synergy
Vault of Whispers
67% of 3 decks +62% synergy
Buried Ruin
67% of 3 decks +62% synergy
Seat of the Synod
67% of 3 decks +60% synergy
Lonely Sandbar
33% of 3 decks +30% synergy
Barren Moor
33% of 3 decks +30% synergy
Reliquary Tower
33% of 3 decks +4% synergy
Bojuka Bog
33% of 3 decks +3% synergy
Mana Artifacts
Mind Stone
100% of 3 decks +83% synergy
Fellwar Stone
100% of 3 decks +79% synergy
Rakdos Signet
100% of 2 decks +70% synergy
Arcane Signet
100% of 3 decks +28% synergy
Sol Ring
100% of 3 decks +16% synergy
Machine God's Effigy
67% of 3 decks +65% synergy
Liquimetal Torque
67% of 3 decks +63% synergy
Dimir Signet
67% of 3 decks +37% synergy
Thought Vessel
33% of 3 decks +16% synergy
Talisman of Dominance
33% of 3 decks +2% synergy
Lands
Drossforge Bridge
100% of 2 decks +96% synergy
Silverbluff Bridge
100% of 2 decks +94% synergy
Shadowblood Ridge
100% of 2 decks +88% synergy
Temple of Malice
100% of 2 decks +86% synergy
Rakdos Carnarium
100% of 2 decks +85% synergy
Izzet Boilerworks
100% of 2 decks +84% synergy
Temple of Deceit
100% of 3 decks +84% synergy
Dimir Aqueduct
100% of 3 decks +83% synergy
Crumbling Necropolis
100% of 2 decks +69% synergy
Smoldering Marsh
100% of 2 decks +67% synergy
Command Tower
100% of 3 decks +26% synergy
Spire of Industry
67% of 3 decks +64% synergy
Mistvault Bridge
67% of 3 decks +62% synergy
Darkwater Catacombs
67% of 3 decks +52% synergy
Terramorphic Expanse
67% of 3 decks +51% synergy
Myriad Landscape
33% of 3 decks +14% synergy
Morphic Pool
33% of 3 decks +7% synergy
Sunken Hollow
33% of 3 decks -1% synergy
Watery Grave
33% of 3 decks -7% synergy