Thassa, Deep-Dwelling + Archaeomancer + Time Stretch

Thassa, Deep-Dwelling

Archaeomancer

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 Archaeomancer.
3. Archaeomancer enters the battlefield, returning Time Stretch from your graveyard to your hand.
4. Repeat every other turn.

This elegant time-loop hinges on abusing end-step triggers to recur extra turns indefinitely. By casting Time Stretch, you secure two consecutive extra turns, giving you all the time you need to set up the engine. Once Thassa, Deep-Dwelling is on your board, her delayed end-step flicker targets Archaeomancer, whose enters-the-battlefield ability promptly fishes Time Stretch right back out of your graveyard and into your hand. Because you get two extra turns for every one you spend casting the spell, you will always have the requisite mana to replay it, locking your opponents out of the game entirely as you take every single turn from that point forward.