Chthonian Nightmare, Greedy Freebooter, Shambling Ghast, and Rowan, Scion of War

Prerequisites

• Chthonian Nightmare in hand
• Greedy Freebooter on the battlefield
• Shambling Ghast in the graveyard
• Rowan, Scion of War on the battlefield
• available

Steps

1. Activate Rowan by tapping it, causing black and red spells you cast to cost less for each life you've lost this turn
2. Cast Chthonian Nightmare by paying
3. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get
4. Activate Chthonian Nightmare by paying , sacrificing Greedy Freebooter and returning Chthonian Nightmare from the battlefield to your hand
5. When Greedy Freebooter dies, it triggers, causing you to scry 1 and create a Treasure token
6. Resolve the Chthonian Nightmare ability, returning Shambling Ghast from your graveyard to the battlefield
7. Activate the Treasure by tapping and sacrificing it, adding
8. Cast Chthonian Nightmare by paying
9. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get
10. Activate Chthonian Nightmare by paying , sacrificing Shambling Ghast and returning Chthonian Nightmare from the battlefield to your hand
11. When Shambling Ghast dies, it triggers, creating a Treasure token
12. Resolve the Chthonian Nightmare ability, returning Greedy Freebooter from your graveyard to the battlefield
13. Activate the Treasure by tapping and sacrificing it, adding
14. Repeat from step 2

Results

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