Time Sieve + Biotransference + Arcane Adaptation + Rotlung Reanimator

Time Sieve
Biotransference
Arcane Adaptation
Rotlung Reanimator

Requires
All permanents on the battlefield. You control at least five other creatures. "Cleric" chosen with Arcane Adaptation.
Steps
  1. Activate Time Sieve by tapping it and sacrificing five creatures
  2. Rotlung Reanimator triggers five times, creating five 2/2 Zombie creature tokens
  3. Resolve the Time Sieve ability, causing you to take an extra turn after this one
  4. Repeat each turn
Results
Infinite turns.