Koll, the Forgemaster, Demonmail Hauberk, Puresteel Paladin, and Myr Moonvessel

Prerequisites

• Koll, the Forgemaster on the battlefield
• Demonmail Hauberk on the battlefield
• Puresteel Paladin on the battlefield
• Myr Moonvessel on the battlefield
• You control three or more artifacts, including an Equipment except Demonmail Hauberk

Steps

1. Activate an equipment except Demonmail Hauberk's equip ability by paying , attaching it to Myr Moonvessel
2. Activate Demonmail Hauberk by sacrificing Myr Moonvessel, targeting Koll
3. When Myr Moonvessel dies, it and Koll trigger
4. Resolve the Myr Moonvessel trigger, adding
5. Resolve the Koll trigger, returning it from your graveyard to your hand
6. Resolve the Demonmail Hauberk ability, attaching it to Koll
7. Cast Myr Moonvessel by paying its mana cost
8. Repeat

Results

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