Progenitor Mimic + Eternal Witness + Capture of Jingzhou

Progenitor Mimic

Eternal Witness

Capture of Jingzhou

How it works

1. Cast Capture of Jingzhou 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 Capture of Jingzhou from your graveyard to your hand.
4. Repeat.