Songs of the Damned, Chthonian Nightmare, and Mnemonic Wall

Prerequisites

• Songs of the Damned in hand
• Chthonian Nightmare in hand
• Mnemonic Wall 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 , sacrificing Mnemonic Wall, and returning Chthonian Nightmare from the battlefield to your hand, returning a creature card from your graveyard to the battlefield
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 an amount of equal to Mnemonic Wall's mana value, sacrificing the creature you returned in step 4, and returning Chthonian Nightmare from the battlefield to your hand, returning Mnemonic Wall from your graveyard to the battlefield
8. When Mnemonic Wall enters the battlefield, it triggers, returning Songs of the Damned from your graveyard to your hand
9. 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