Mystic Sanctuary + Capsize + Walk the Aeons

Mystic Sanctuary
Capsize
Walk the Aeons

Requires
All cards in hand. You control at least three additional Islands. 8uuuu available.
Steps
  1. Cast Walk the Aeons by paying 4uu, getting an extra turn after this one
  2. Play Mystic Sanctuary to put Walk the Aeons on top of your library
  3. Cast Capsize for its buyback cost by paying 4uu, returning Mystic Sanctuary to your hand
  4. Move to your next turn
  5. Repeat
Results
Infinite turns.