Echocasting Symposium + Warden of the Eye + Capture of Jingzhou

Echocasting Symposium

Warden of the Eye

Capture of Jingzhou

How it works

1. Cast Capture of Jingzhou by paying its mana cost, causing you to take an extra turn after this one.
2. Move to your next turn. At the beginning of your precombat main phase, Echocasting Symposium's paradigm ability triggers, causing you to cast a copy of it from exile.
3. Resolve the copy, creating a token copy of Warden of the Eye
4. When the Warden of the Eye token enters, it triggers, returning Capture of Jingzhou from your graveyard to your hand.
5. Repeat.