Prototype Portal + Dross Scorpion + Blasting Station + Myr Moonvessel

Prototype Portal

Dross Scorpion

Blasting Station

Myr Moonvessel

How it works

1. Activate Prototype Portal by paying 1 and tapping it, creating a token copy of Myr Moonvessel.
2. When Myr Moonvessel enters, Blasting Station triggers, untapping itself.
3. Activate Blasting 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 C.
6. Resolve the Dross Scorpion trigger, untapping Prototype Portal.
7. Resolve the Blasting Station ability, dealing 1 damage to any target.
8. Repeat.