Requires

Phantom Steed must be on the battlefield. Time Stretch must be in hand. Shipwreck Dowser must be in exile (exiled by Phantom Steed). Mana needed:

Steps

1. Cast Time Stretch, taking an extra two turns after this one.
2. Attack with Phantom Steed.
3. Phantom Steed triggers, creating a token copy of Shipwreck Dowser that is tapped and attacking.
4. Shipwreck Dowser enters, returning Time Stretch from your graveyard to your hand.
5. Pass the turn.
6. Repeat.

Results