Chthonian Nightmare + Shipwreck Dowser + Time Warp

Chthonian Nightmare

Shipwreck Dowser

Time Warp

How it works

1. Cast Time Warp by paying 3, causing you to take an extra turn after this one.
2. Move to your next turn.
3. Cast Chthonian Nightmare by paying 1.
4. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get EEE.
5. Activate Chthonian Nightmare by paying EEEEE, sacrificing a creature with mana value 1 or less, and returning Chthonian Nightmare from the battlefield to your hand, returning Shipwreck Dowser from your graveyard to the battlefield.
6. When Shipwreck Dowser enters the battlefield, it triggers, returning Time Warp from your graveyard to your hand.
7. Cast Chthonian Nightmare by paying 1.
8. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get EEE.
9. Activate Chthonian Nightmare by paying at most E, sacrificing Shipwreck Dowser, and returning Chthonian Nightmare from the battlefield to your hand, returning a creature with mana value 1 or less from your graveyard to the battlefield.
10. Repeat.

This recursive engine harnesses the constant recurrence of Time Warp to take infinite turns, locking down the game through a tightly woven graveyard loop. You begin by leveraging Shipwreck Dowser's entering-the-battlefield trigger to pull your extra-turn spell right back out of the graveyard and into your hand. To keep the cycle going, Chthonian Nightmare acts as both the sacrificial outlet and the reanimation engine, bouncing itself back to your hand while utilizing its initial energy and subsequent inputs to swap creatures between the battlefield and the graveyard.