Koll, the Forgemaster, Demonmail Hauberk, Rograkh, Son of Rohgahh, and Phyrexian Walker

Prerequisites

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

Steps

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

Results

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