Phantom Steed + Walk the Aeons + Eternal Witness

Phantom Steed

Walk the Aeons

Eternal Witness

How it works

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