Mikaeus, the Unhallowed + Cauldron of Souls + Dross Scorpion + Altar of Dementia

Mikaeus, the Unhallowed
Cauldron of Souls
Dross Scorpion
Altar of Dementia

Requires
Mikaeus, the Unhallowed must be on the battlefield. Cauldron of Souls must be on the battlefield. Dross Scorpion must be on the battlefield. Altar of Dementia must be on the battlefield.
Steps
  1. Activate Cauldron of Souls by tapping it, giving Dross Scorpion persist until end of turn.
  2. Activate Altar of Dementia by sacrificing Dross Scorpion.
  3. Dross Scorpion dies, triggering its ability, its undying ability and its persist ability.
  4. Resolve the first Dross Scorpion trigger, untapping Cauldron of Souls.
  5. Resolve the Dross Scorpion persist trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
  6. Activate Altar of Dementia by sacrificing Dross Scorpion.
  7. Dross Scorpion dies, triggering its ability and its undying ability.
  8. Resolve the first Dross Scorpion trigger, untapping Cauldron of Souls.
  9. Resolve the second Dross Scorpion trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  10. Activate Altar of Dementia by sacrificing Dross Scorpion.
  11. Dross Scorpion dies, triggering its ability and its persist ability.
  12. Repeat from step 4.
  13. Resolve all Altar of Dementia abilities, causing any number of players to mill infinite cards.
Results
Infinite death triggers. Infinite ETB. Infinite LTB. Infinite mill. Infinite sacrifice triggers. Infinite self-mill.

Mikaeus, the Unhallowed
0.15% of 1337 decks 2 decks
Reaper King
0.02% of 5423 decks 1 decks
Drana, Liberator of Malakir
0.25% of 400 decks 1 decks
Tergrid, God of Fright
0.01% of 8997 decks 1 decks
Korvold, Fae-Cursed King
0.01% of 15487 decks 1 decks
Erebos, Bleak-Hearted
0.37% of 269 decks 1 decks
Olivia, Crimson Bride
0.04% of 2525 decks 1 decks
Sheoldred, the Apocalypse
0.01% of 9554 decks 1 decks
Trazyn the Infinite
0.05% of 1990 decks 1 decks
Alharu, Solemn Ritualist // Sengir, the Dark Baron
16.67% of 6 decks 1 decks
Imotekh the Stormlord
0.02% of 6538 decks 1 decks
High Synergy Cards
Phyrexian Altar
92% of 12 decks +88% synergy
Ashnod's Altar
92% of 12 decks +84% synergy
Urborg, Tomb of Yawgmoth
67% of 12 decks +57% synergy
Cabal Coffers
67% of 12 decks +56% synergy
Blood Artist
58% of 12 decks +47% synergy
Crypt Ghast
50% of 12 decks +45% synergy
Viscera Seer
50% of 12 decks +41% synergy
Krark-Clan Ironworks
42% of 12 decks +41% synergy
K'rrik, Son of Yawgmoth
42% of 12 decks +40% synergy
Phyrexian Arena
50% of 12 decks +35% synergy
Top Cards
Pitiless Plunderer
42% of 12 decks +34% synergy
Animate Dead
42% of 12 decks +32% synergy
Triskelion
33% of 12 decks +33% synergy
Blasting Station
33% of 12 decks +33% synergy
Gilded Lotus
33% of 12 decks +30% synergy
Massacre Wurm
33% of 12 decks +29% synergy
Necropotence
33% of 12 decks +28% synergy
Living Death
33% of 12 decks +28% synergy
Buried Alive
33% of 12 decks +28% synergy
Gray Merchant of Asphodel
33% of 12 decks +24% synergy
Creatures
Zulaport Cutthroat
33% of 12 decks +23% synergy
Grim Poppet
25% of 12 decks +25% synergy
Tatterkite
25% of 12 decks +25% synergy
Workhorse
25% of 12 decks +25% synergy
Cryptic Trilobite
25% of 12 decks +25% synergy
Pili-Pala
25% of 12 decks +25% synergy
Magus of the Coffers
25% of 12 decks +24% synergy
Kokusho, the Evening Star
25% of 12 decks +23% synergy
Sidisi, Undead Vizier
25% of 12 decks +23% synergy
Pawn of Ulamog
25% of 12 decks +23% synergy
Walking Ballista
25% of 12 decks +22% synergy
Butcher of Malakir
25% of 12 decks +22% synergy
Yawgmoth, Thran Physician
25% of 12 decks +21% synergy
Reassembling Skeleton
25% of 12 decks +21% synergy
Ayara, First of Locthwain
25% of 12 decks +21% synergy
Sheoldred, Whispering One
25% of 12 decks +20% synergy
Carrion Feeder
25% of 12 decks +20% synergy
Syr Konrad, the Grim
25% of 12 decks +16% synergy
Solemn Simulacrum
25% of 12 decks +11% synergy
Instants
Vampiric Tutor
50% of 12 decks +32% synergy
Dark Ritual
33% of 12 decks +11% synergy
Entomb
25% of 12 decks +18% synergy
Sorceries
Demonic Tutor
58% of 12 decks +36% synergy
Reanimate
33% of 12 decks +18% synergy
Toxic Deluge
33% of 12 decks +16% synergy
Feed the Swarm
27% of 11 decks +9% synergy
Grim Tutor
25% of 12 decks +20% synergy
Diabolic Tutor
25% of 12 decks +19% synergy
Night's Whisper
25% of 12 decks +16% synergy
Sign in Blood
25% of 12 decks +15% synergy
Utility Artifacts
Bolas's Citadel
33% of 12 decks +24% synergy
Skullclamp
33% of 12 decks +21% synergy
Lightning Greaves
33% of 12 decks +8% synergy
Nim Deathmantle
25% of 12 decks +24% synergy
Expedition Map
25% of 12 decks +22% synergy
Swiftfoot Boots
25% of 12 decks -3% synergy
Enchantments
Mortuary
25% of 12 decks +25% synergy
Dictate of Erebos
25% of 12 decks +21% synergy
Grave Pact
25% of 12 decks +21% synergy
Planeswalkers
Liliana, Dreadhorde General
25% of 12 decks +21% synergy
Utility Lands
Phyrexian Tower
42% of 12 decks +33% synergy
Reliquary Tower
42% of 12 decks +12% synergy
Bojuka Bog
42% of 12 decks +11% synergy
Takenuma, Abandoned Mire
36% of 11 decks +26% synergy
Cabal Stronghold
33% of 12 decks +30% synergy
Command Beacon
33% of 12 decks +29% synergy
Wasteland
25% of 12 decks +24% synergy
Thespian's Stage
25% of 12 decks +22% synergy
Strip Mine
25% of 12 decks +22% synergy
High Market
25% of 12 decks +22% synergy
Castle Locthwain
25% of 12 decks +20% synergy
Nykthos, Shrine to Nyx
25% of 12 decks +19% synergy
Ancient Tomb
25% of 12 decks +14% synergy
Mana Artifacts
Sol Ring
75% of 12 decks -9% synergy
Hedron Archive
25% of 12 decks +22% synergy
Mana Vault
25% of 12 decks +19% synergy
Mind Stone
25% of 12 decks +8% synergy
Arcane Signet
25% of 12 decks -47% synergy
Lands
Command Tower
67% of 12 decks -7% synergy
Myriad Landscape
33% of 12 decks +14% synergy
Exotic Orchard
25% of 12 decks -11% synergy