Prototype Portal, Dross Scorpion, Lithatog, and Myr Moonvessel

Prerequisites

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

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinitely large Lithatog until end of turn