Prototype Portal + Dross Scorpion + Blasting Station + Cathodion

Prototype Portal

Dross Scorpion

Blasting Station

Cathodion

How it works

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