Prototype Portal + Dross Scorpion + Blasting Station + Su-Chi

Prototype Portal

Dross Scorpion

Blasting Station

Su-Chi

How it works

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