Savor the Moment + Wilderness Reclamation + Conjurer's Closet + Eternal Witness

Savor the Moment
Wilderness Reclamation
Conjurer's Closet
Eternal Witness

Requires
All permanents on the battlefield. Savor the Moment in hand. 1uu available each turn.
Steps
  1. Cast Savor the Moment gaining an extra turn
  2. Move to your end step
  3. Conjurer's Closet and Wilderness Reclamation trigger
  4. Resolve Wilderness Reclamation, untapping all lands you control
  5. Resolve Conjurer's Closet's trigger, exiling Eternal Witness and returning it to the battlefield
  6. Eternal Witness enters, returning Savor the Moment from your graveyard to your hand
  7. Repeat
Results
Infinite turns.