Chthonian Nightmare, Patron of the Arts, and Umori, the Collector

Prerequisites

• Chthonian Nightmare on the battlefield
• Patron of the Arts on the battlefield
• Umori, the Collector on the battlefield
• You have at least
• You have a creature card with mana value 3 or less in your graveyard

Steps

1. Activate Chthonian Nightmare by paying at most , 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
7. Activate Chthonian Nightmare by paying , 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
12. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite storm count
• Infinite energy counters