Requires

Phantom Steed must be on the battlefield. Time Stretch must be in hand. Eternal Witness must be in exile (exiled by Phantom Steed). An opponent can not block 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 Eternal Witness that is tapped and attacking.
4. Eternal Witness enters, returning Time Stretch from your graveyard to your hand.
5. Pass the turn.
6. Repeat.

Results