Progenitor Mimic + Archaeomancer + Walk the Aeons

Progenitor Mimic

Archaeomancer

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