Prototype Portal, Dross Scorpion, Krark-Clan Grunt, and Myr Moonvessel

Prerequisites

• Prototype Portal on the battlefield
• Dross Scorpion on the battlefield
• Krark-Clan Grunt 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. Activate Krark-Clan Grunt by sacrificing Myr Moonvessel
3. When Myr Moonvessel dies, Myr Moonvessel and Dross Scorpion trigger
4. Resolve the Myr Moonvessel trigger, adding
5. Resolve the Dross Scorpion trigger, untapping Prototype Portal
6. Resolve the Krark-Clan Grunt ability, giving it +1/+0 and first strike until end of turn
7. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinitely powerful Krark-Clan Grunt until end of turn