Songs of the Damned, Chthonian Nightmare, and Shipwreck Dowser

Prerequisites

• Songs of the Damned in hand
• Chthonian Nightmare in hand
• Shipwreck Dowser on the battlefield
• available

Steps

1. Cast Songs of the Damned by paying
2. Shipwreck Dowser's prowess ability triggers, giving it +1/+1 until end of turn
3. Resolve Songs of the Damned, adding for each creature card in your graveyard
4. Cast Chthonian Nightmare by paying
5. Shipwreck Dowser's prowess ability triggers, giving it +1/+1 until end of turn
6. Chthonian Nightmare enters the battlefield, triggering itself, causing you to get
7. Activate Chthonian Nightmare by paying , sacrificing Shipwreck Dowser, and returning Chthonian Nightmare from the battlefield to your hand, returning a creature card from your graveyard to the battlefield
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 an amount of equal to Shipwreck Dowser's mana value, sacrificing the creature you returned in step 4, and returning Chthonian Nightmare from the battlefield to your hand, returning Shipwreck Dowser from your graveyard to the battlefield
11. When Shipwreck Dowser enters the battlefield, it triggers, returning Songs of the Damned from your graveyard to your hand
12. 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