Chthonian Nightmare + Timeless Witness + Time Warp

Chthonian Nightmare

Timeless Witness

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 EEEE, sacrificing a creature with mana value 2 or less, and returning Chthonian Nightmare from the battlefield to your hand, returning Timeless Witness from your graveyard to the battlefield.
6. When Timeless Witness 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 EE, sacrificing Timeless Witness, and returning Chthonian Nightmare from the battlefield to your hand, returning a creature with mana value 2 or less from your graveyard to the battlefield.
10. Repeat.

This masterful loop hinges on an endless recursion of extra turns, fueled entirely by the resource management of Chthonian Nightmare. By utilizing the energy generated when Chthonian Nightmare enters the battlefield, you can sacrifice a creature to return Timeless Witness from your graveyard, whose enters-the-battlefield trigger conveniently fishes Time Warp right back out of your graveyard to be cast again. Since Timeless Witness can then be sacrificed to loop a smaller creature and fund the next cycle, you sustain an unbroken chain of resurrections that ensures you never have to pass the turn back to your opponents.