Delina, Wild Mage + Medomai the Ageless

Delina, Wild Mage
Medomai the Ageless

Requires
All permanents on the battlefield. Delina does not have summoning sickness. An opponent is unable to block your creatures.
Steps
  1. Attack with Delina
  2. Delina triggers, creating at least one token copy of Medomai that is tapped and attacking
  3. The Medomai token(s) deal combat damage, triggering their abilities, allowing you to take at least one extra turn after this one
  4. Repeat
Results
Infinite turns.