Songs of the Damned, Chthonian Nightmare, and The Immortal Weapons

Prerequisites

• Songs of the Damned in hand
• Chthonian Nightmare in hand
• The Immortal Weapons on the battlefield
• available

Steps

1. Cast Songs of the Damned by paying
2. When you cast Songs of the Damned, The Immortal Weapons triggers, giving target creature +2/+0 and menace 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. When you cast Chthonian Nightmare, The Immortal Weapons triggers, giving target creature +2/+0 and menace until end of turn
6. Chthonian Nightmare enters the battlefield, triggering itself, causing you to get
7. Activate Chthonian Nightmare by paying , sacrificing The Immortal Weapons, and returning Chthonian Nightmare from the battlefield to your hand, returning a creature card with mana value 1 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 The Immortal Weapons's mana value, sacrificing the creature you returned in step 4, and returning Chthonian Nightmare from the battlefield to your hand, returning The Immortal Weapons from your graveyard to the battlefield
11. When The Immortal Weapons enters the battlefield, it triggers, returning Songs of the Damned from your graveyard to your hand
12. Repeat

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite black mana
• Infinite death triggers
• Infinite magecraft triggers
• Infinite creature sacrifice triggers
• Infinite storm count
• Infinitely powerful creatures you control until end of turn