Archaeomancer + Mystic Reflection + Capture of Jingzhou + Spore Swarm

Archaeomancer

Mystic Reflection

Capture of Jingzhou

Spore Swarm

How it works

1. Cast Capture of Jingzhou by paying 3, granting you an extra turn after this one.
2. Cast Mystic Reflection by paying 1, causing the next creatures or planeswalkers to enter the battlefield this turn to enter as copies of Archaeomancer.
3. Cast Spore Swarm by paying 3, creating three token copies of Archaeomancer.
4. Each of the Archaeomancer's ETBs trigger, returning Mystic Reflection, Capture of Jingzhou, and Spore Swarm to your hand.
5. Repeat.