Koll, the Forgemaster, Demonmail Hauberk, Ornithopter, and Shield Sphere

Prerequisites

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

Steps

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

Results

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