Songs of the Damned, Chthonian Nightmare, and Greenwarden of Murasa

Prerequisites

• Songs of the Damned in hand
• Chthonian Nightmare in hand
• Greenwarden of Murasa on the battlefield
• available

Steps

1. Cast Songs of the Damned by paying , adding for each creature card in your graveyard
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 zero , sacrificing Greenwarden of Murasa, and returning Chthonian Nightmare from the battlefield to your hand
5. When Greenwarden dies, its last ability triggers; choose not to exile it
6. Resolve Chthonian Nightmare's ability, returning a creature card from your graveyard to the battlefield
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 an amount of equal to Greenwarden of Murasa's mana value, sacrificing the creature you returned in step 4, and returning Chthonian Nightmare from the battlefield to your hand, returning Greenwarden of Murasa from your graveyard to the battlefield
10. When Greenwarden of Murasa enters the battlefield, it triggers, returning Songs of the Damned from your graveyard to your hand
11. Repeat

Results

• Infinite energy counters
• Infinite creature LTB
• Infinite creature ETB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite storm count
• Infinite magecraft triggers
• Infinite black mana