Requires

Phantom Steed must be on the battlefield. Temporal Manipulation must be in hand. Mnemonic Wall must be in exile (exiled by Phantom Steed). An opponent can not block Phantom Steed. Mana needed:

Steps

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

Results