Progenitor Mimic + Capture of Jingzhou + Shipwreck Dowser

Progenitor Mimic

Capture of Jingzhou

Shipwreck Dowser

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 Shipwreck Dowser.
3. When the token Shipwreck Dowser enters the battlefield, it triggers itself, returning Capture of Jingzhou from your graveyard to your hand.
4. Repeat.