Mikaeus, the Unhallowed + Cauldron of Souls + Dross Scorpion + Carrion Feeder

Mikaeus, the Unhallowed
Cauldron of Souls
Dross Scorpion
Carrion Feeder

Requires
Mikaeus, the Unhallowed must be on the battlefield. Cauldron of Souls must be on the battlefield. Dross Scorpion must be on the battlefield. Carrion Feeder must be on the battlefield.
Steps
  1. Activate Cauldron of Souls by tapping it, giving Dross Scorpion persist until end of turn.
  2. Activate Carrion Feeder 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 Carrion Feeder 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 Carrion Feeder by sacrificing Dross Scorpion.
  11. Dross Scorpion dies, triggering its ability and its persist ability.
  12. Repeat from step 4.
  13. Resolve all Carrion Feeder abilities, putting infinite +1/+1 counters on it.
Results
Infinite +1/+1 counters on Carrion Feeder. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

Mikaeus, the Unhallowed
0.22% of 1368 decks 3 decks
Gev, Scaled Scorch
0.04% of 4825 decks 2 decks
Alharu, Solemn Ritualist // Sengir, the Dark Baron
16.67% of 6 decks 1 decks
Massacre Girl
0.05% of 1835 decks 1 decks
Meren of Clan Nel Toth
0.01% of 15213 decks 1 decks
Kokusho, the Evening Star
0.12% of 859 decks 1 decks
Shirei, Shizo's Caretaker
0.02% of 5441 decks 1 decks
Reyhan, Last of the Abzan // Silas Renn, Seeker Adept
1.41% of 71 decks 1 decks
High Synergy Cards
Ashnod's Altar
91% of 11 decks +83% synergy
Viscera Seer
73% of 11 decks +64% synergy
Triskelion
64% of 11 decks +63% synergy
Phyrexian Altar
64% of 11 decks +60% synergy
Urborg, Tomb of Yawgmoth
64% of 11 decks +54% synergy
Zulaport Cutthroat
64% of 11 decks +54% synergy
Blood Artist
64% of 11 decks +52% synergy
Yawgmoth, Thran Physician
50% of 10 decks +46% synergy
Ayara, First of Locthwain
50% of 10 decks +46% synergy
Gray Merchant of Asphodel
55% of 11 decks +46% synergy
Top Cards
Gravecrawler
45% of 11 decks +43% synergy
Mind Stone
45% of 11 decks +28% synergy
Toxic Deluge
45% of 11 decks +28% synergy
Swiftfoot Boots
45% of 11 decks +18% synergy
Cryptic Trilobite
40% of 10 decks +40% synergy
Putrid Goblin
40% of 10 decks +39% synergy
K'rrik, Son of Yawgmoth
40% of 10 decks +38% synergy
Syr Konrad, the Grim
40% of 10 decks +31% synergy
Blasting Station
36% of 11 decks +36% synergy
Walking Ballista
36% of 11 decks +34% synergy
Creatures
Drivnod, Carnage Dominus
38% of 8 decks +34% synergy
Crypt Ghast
36% of 11 decks +31% synergy
Pitiless Plunderer
36% of 11 decks +29% synergy
Lesser Masticore
30% of 10 decks +30% synergy
Fain, the Broker
30% of 10 decks +29% synergy
Tatterkite
27% of 11 decks +27% synergy
Workhorse
27% of 11 decks +27% synergy
Puppeteer Clique
27% of 11 decks +26% synergy
Butcher of Malakir
27% of 11 decks +24% synergy
Plaguecrafter
27% of 11 decks +22% synergy
Instants
Dark Ritual
36% of 11 decks +14% synergy
Village Rites
30% of 10 decks +20% synergy
Vampiric Tutor
27% of 11 decks +9% synergy
Sorceries
Demonic Tutor
45% of 11 decks +23% synergy
Damnation
36% of 11 decks +28% synergy
Feed the Swarm
30% of 10 decks +12% synergy
Diabolic Intent
27% of 11 decks +19% synergy
Victimize
27% of 11 decks +16% synergy
Reanimate
27% of 11 decks +12% synergy
Utility Artifacts
Altar of Dementia
36% of 11 decks +34% synergy
Lightning Greaves
36% of 11 decks +11% synergy
Bolas's Citadel
30% of 10 decks +21% synergy
Krark-Clan Ironworks
27% of 11 decks +26% synergy
Jet Medallion
27% of 11 decks +24% synergy
Skullclamp
27% of 11 decks +15% synergy
Enchantments
Black Market
36% of 11 decks +32% synergy
Animate Dead
36% of 11 decks +27% synergy
Phyrexian Arena
36% of 11 decks +21% synergy
Bastion of Remembrance
30% of 10 decks +24% synergy
Dictate of Erebos
27% of 11 decks +24% synergy
Grave Pact
27% of 11 decks +23% synergy
Utility Lands
Cabal Coffers
55% of 11 decks +44% synergy
Bojuka Bog
45% of 11 decks +15% synergy
Phyrexian Tower
36% of 11 decks +28% synergy
Castle Locthwain
30% of 10 decks +25% synergy
Cabal Stronghold
27% of 11 decks +24% synergy
Reliquary Tower
27% of 11 decks -2% synergy
Mana Artifacts
Sol Ring
82% of 11 decks -3% synergy
Arcane Signet
60% of 10 decks -12% synergy
Commander's Sphere
36% of 11 decks +21% synergy
Lands
Command Tower
64% of 11 decks -10% synergy
Myriad Landscape
36% of 11 decks +17% synergy