Chthonian Nightmare + Izzet Chronarch + Time Warp

Chthonian Nightmare

Izzet Chronarch

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 Izzet Chronarch from your graveyard to the battlefield.
6. When Izzet Chronarch 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 Izzet Chronarch, 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 cunning loop achieves infinite turns by recycling Time Warp over and over, backed by the self-bouncing recursion of Chthonian Nightmare. By using the Nightmare's enter-the-battlefield energy generation alongside its ability to swap creatures from your graveyard, you can continually resurrect Izzet Chronarch to pull the extra-turn spell right back to your hand. Meanwhile, sacrificing and replaying the Chronarch allows you to cycle through smaller fodder or keep your engine running smoothly, turning extra energy into an unending succession of fresh turns.