Koll, the Forgemaster, Demonmail Hauberk, Rograkh, Son of Rohgahh, and Ornithopter

Prerequisites

• Koll, the Forgemaster on the battlefield
• Demonmail Hauberk on the battlefield
• Rograkh, Son of Rohgahh on the battlefield
• Ornithopter on the battlefield

Steps

1. Activate Demonmail Hauberk's equip ability by sacrificing Rograkh, targeting Ornithopter
2. Rograkh dies, triggering Koll, returning Rograkh from your graveyard to your hand
3. Resolve the Demonmail Hauberk ability, attaching it to Ornithopter
4. Cast Rograkh by paying
5. Activate Demonmail Hauberk's equip ability by sacrificing Ornithopter, targeting Rograkh
6. Ornithopter dies, triggering Koll, returning Ornithopter from your graveyard to your hand
7. Resolve the Demonmail Hauberk ability, attaching it to Rograkh
8. Cast Ornithopter by paying
9. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count