Progenitor Mimic + Eternal Witness + Walk the Aeons

Progenitor Mimic

Eternal Witness

Walk the Aeons

How it works

1. Cast Walk the Aeons by paying its mana cost, taking an extra turn after this one.
2. At the beginning of your next upkeep, Progenitor Mimic triggers, creating a token copy of Eternal Witness.
3. When the token Eternal Witness enters the battlefield, it triggers itself, returning Walk the Aeons from your graveyard to your hand.
4. Repeat.