Progenitor Mimic + Salvager of Secrets + Walk the Aeons

Progenitor Mimic

Salvager of Secrets

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 Salvager of Secrets.
3. When the token Salvager of Secrets enters the battlefield, it triggers itself, returning Walk the Aeons from your graveyard to your hand.
4. Repeat.