Prototype Portal, Dross Scorpion, Grinding Station, and Myr Moonvessel

Prerequisites

• Prototype Portal on the battlefield
• Dross Scorpion on the battlefield
• Grinding Station on the battlefield
• Myr Moonvessel on the battlefield
• undefined available

Steps

1. Activate Prototype Portal by paying and tapping it, creating a token copy of Myr Moonvessel
2. When the token Myr Moonvessel enters, Grinding Station triggers, untapping itself
3. Activate Grinding Station by sacrificing Myr Moonvessel and tapping it
4. When Myr Moonvessel dies, Myr Moonvessel and Dross Scorpion trigger
5. Resolve the Myr Moonvessel trigger, adding
6. Resolve the Dross Scorpion trigger, untapping Prototype Portal
7. Resolve the Grinding Station ability, causing target player to mill three cards
8. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite mill
• Infinite self-mill