Hanna, Ship's Navigator + Coretapper + Magistrate's Scepter

Hanna, Ship's Navigator
Coretapper
Magistrate's Scepter

Requires
All permanents on the battlefield. Coretapper and Hanna do not have summoning sickness. 3wu available each turn.
Steps
  1. Tap Coretapper to put a charge counter on Magistrate's Scepter
  2. Sacrifice Coretapper to put 2 counters on Magistrate's Scepter
  3. Tap Magistrate's Scepter and remove 3 counters to take an extra turn
  4. Pay 1wu and tap Hanna, returning Coretapper from your graveyard to your hand
  5. Cast Coretapper
  6. Pass the turn
  7. Repeat
Results
Infinite turns.