Thassa, Deep-Dwelling + Mnemonic Wall + Time Stretch

Thassa, Deep-Dwelling

Mnemonic Wall

Time Stretch

How it works

1. Cast Time Stretch by paying 8, getting two extra turns after this one.
2. At the beginning of your end step, Thassa triggers, blinking Mnemonic Wall.
3. Mnemonic Wall enters the battlefield, returning Time Stretch from your graveyard to your hand.
4. Repeat every other turn.