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

Prerequisites

• Koll, the Forgemaster on the battlefield
• Demonmail Hauberk on the battlefield
• Rograkh, Son of Rohgahh on the battlefield
• Memnite on the battlefield
• Demonmail Hauberk attached to Rograkh

Steps

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

Results

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