Requires

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

Steps

1. Cast Time Warp, taking an extra turn 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 Warp from your graveyard to your hand.
5. Pass the turn.
6. Repeat.

Results