Archaeomancer + Mystic Reflection + Time Warp + From Under the Floorboards

Archaeomancer

Mystic Reflection

Time Warp

From Under the Floorboards

How it works

1. Cast Time Warp 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 From Under the Floorboards by paying 3, creating three token copies of Archaeomancer and gaining 3 life.
4. Each of the Archaeomancer's ETBs trigger, returning Mystic Reflection, Time Warp, and From Under the Floorboards to your hand.
5. Repeat.