Archaeomancer + Mystic Reflection + Temporal Manipulation + Spore Swarm

Archaeomancer

Mystic Reflection

Temporal Manipulation

Spore Swarm

How it works

1. Cast Temporal Manipulation 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, Temporal Manipulation, and Spore Swarm to your hand.
5. Repeat.