Chthonian Nightmare, Greedy Freebooter, Shambling Ghast, and Helm of Awakening

Prerequisites

• Chthonian Nightmare in hand
• Greedy Freebooter on the battlefield
• Shambling Ghast in the graveyard
• Helm of Awakening on the battlefield
• available

Steps

1. Cast Chthonian Nightmare by paying
2. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get
3. Activate Chthonian Nightmare by paying , sacrificing Greedy Freebooter and returning Chthonian Nightmare from the battlefield to your hand
4. When Greedy Freebooter dies, it triggers, causing you to scry 1 and create a Treasure token
5. Resolve the Chthonian Nightmare ability, returning Shambling Ghast from your graveyard to the battlefield
6. Activate the Treasure by tapping and sacrificing it, adding
7. Cast Chthonian Nightmare by paying
8. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get
9. Activate Chthonian Nightmare by paying , sacrificing Shambling Ghast and returning Chthonian Nightmare from the battlefield to your hand
10. When Shambling Ghast dies, it triggers, creating a Treasure token
11. Resolve the Chthonian Nightmare ability, returning Greedy Freebooter from your graveyard to the battlefield
12. Activate the Treasure by tapping and sacrificing it, adding
13. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite scry 1
• Infinite storm count
• Infinite energy counters