Progenitor Mimic + Temporal Manipulation + Greenwarden of Murasa

Progenitor Mimic

Temporal Manipulation

Greenwarden of Murasa

How it works

1. Cast Temporal Manipulation 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 Temporal Manipulation from your graveyard to your hand.
4. Repeat.