Chthonian Nightmare + Mnemonic Wall + Time Warp

Chthonian Nightmare

Mnemonic Wall

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 Mnemonic Wall from your graveyard to the battlefield.
6. When Mnemonic Wall 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 Mnemonic Wall, 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 ingenious loop turns Chthonian Nightmare into a recursive engine that exploits energy management and creature recycling. By leveraging the entry trigger of Mnemonic Wall to buy back Time Warp from the graveyard every cycle, you secure infinite turns to dominate the game. Meanwhile, Chthonian Nightmare keeps itself safe by bouncing back to your hand while perpetually looping your fodder creature and the Wall, ensuring your extra-turn lock is unbreakable.