Chthonian Nightmare + Patron of the Arts + Stone Calendar

Chthonian Nightmare

Patron of the Arts

Stone Calendar

How it works

1. Activate Chthonian Nightmare by paying at most EEE, sacrificing Patron of the Arts and returning Chthonian Nightmare from the battlefield to your hand.
2. When Patron of the Arts dies, it triggers, creating a Treasure token.
3. Resolve the Chthonian Nightmare ability, returning another creature card from your graveyard to the battlefield.
4. Activate the Treasure by tapping and sacrificing it, adding .
5. Cast Chthonian Nightmare by paying .
6. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get EEE.
7. Activate Chthonian Nightmare by paying EEE, sacrificing another creature and returning Chthonian Nightmare from the battlefield to your hand, returning Patron of the Arts from your graveyard to the battlefield.
8. When Patron of the Arts enters the battlefield, it triggers, creating a Treasure token.
9. Activate the Treasure by tapping and sacrificing it, adding .
10. Cast Chthonian Nightmare by paying .
11. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get EEE.
12. Repeat.

This clever loop turns the energy and recursion of Chthonian Nightmare into a perpetual motion machine by leveraging Patron of the Arts to constantly fund its casting cost. Each time Patron of the Arts enters or dies, it feeds the engine by generating a Treasure token, which you sacrifice to pay for the black mana required to recast the enchantment. Meanwhile, Stone Calendar quietly reduces that casting cost, ensuring the loop stays net-positive so you can endlessly trigger sacrifices, enters-the-battlefield effects, and death triggers.