Chthonian Nightmare + Temporal Manipulation + Mnemonic Wall

Chthonian Nightmare

Temporal Manipulation

Mnemonic Wall

How it works

1. Cast Temporal Manipulation 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 Temporal Manipulation 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.