Koll, the Forgemaster, Demonmail Hauberk, Crookshank Kobolds, and Phyrexian Walker

Prerequisites

• Koll, the Forgemaster on the battlefield
• Demonmail Hauberk on the battlefield
• Crookshank Kobolds on the battlefield
• Phyrexian Walker on the battlefield
• Demonmail Hauberk attached to Crookshank Kobolds

Steps

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

Results

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