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

Prerequisites

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

Steps

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

Results

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