Chthonian Nightmare + Mnemonic Wall + Notorious Throng

Chthonian Nightmare

Mnemonic Wall

Notorious Throng

How it works

1. Deal combat damage using a Rogue
2. Cast Notorious Throng for its prowl cost by paying 5, causing you to take an extra turn after this one.
3. Move to your next turn.
4. Cast Chthonian Nightmare by paying 1.
5. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get EEE.
6. 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 Mnemonic Wall from your graveyard to the battlefield.
7. When Mnemonic Wall enters the battlefield, it triggers, returning Notorious Throng from your graveyard to your hand.
8. Cast Chthonian Nightmare by paying 1.
9. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get EEE.
10. Activate Chthonian Nightmare by paying at most EE, sacrificing Mnemonic Wall, 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.
11. Repeat.

This ingenious loop begins on your extra turn granted by Notorious Throng, which you cast for its prowl cost after dealing combat damage with a Rogue. To sustain this momentum, Chthonian Nightmare enters the battlefield to supply the necessary energy counters to fuel its own recursive loop. You then sacrifice a cheap creature to recur Mnemonic Wall, whose enter-the-battlefield ability plucks Notorious Throng right back out of your graveyard. Finally, you sacrifice the Wall itself back to Chthonian Nightmare to bring your initial sacrifice fodder back, allowing you to replay Notorious Throng and repeat the whole sequence for infinite turns.