Koll, the Forgemaster, Demonmail Hauberk, Ornithopter, and Memnite

Prerequisites

• Koll, the Forgemaster on the battlefield
• Demonmail Hauberk on the battlefield
• Ornithopter on the battlefield
• Memnite on the battlefield
• Demonmail Hauberk attached to Ornithopter

Steps

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

Results

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