Koll, the Forgemaster, Demonmail Hauberk, Phyrexian Walker, and Shield Sphere

Prerequisites

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

Steps

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

Results

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