Progenitor Mimic + Walk the Aeons + Greenwarden of Murasa

Progenitor Mimic

Walk the Aeons

Greenwarden of Murasa

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