Blasting Station + Fiend Hunter + Metamorphosis Fanatic

Blasting Station

Fiend Hunter

Metamorphosis Fanatic

How it works

1. Cast Fiend Hunter by paying its mana cost.
2. When Fiend Hunter enters, its first ability and Blasting Station trigger.
3. Resolve the Fiend Hunter trigger, exiling Metamorphosis Fanatic.
4. Resolve the Blasting Station trigger, untapping it.
5. Activate Blasting Station by tapping it and sacrificing Fiend Hunter.
6. When Fiend Hunter dies, its second ability triggers, returning Metamorphosis Fanatic from exile to the battlefield.
7. When Metamorphosis Fanatic enters, it and Blasting Station trigger.
8. Resolve the Blasting Station trigger, untapping it.
9. Resolve the Metamorphosis Fanatic trigger, returning Fiend Hunter from your graveyard to the battlefield.
10. Repeat steps 2 through 4 one additional time.
11. Resolve the Blasting Station ability from step 5.
12. Repeat from step 5.

This clever loop sets up an endless cycle of sacrifice and resurrection using Fiend Hunter and Metamorphosis Fanatic to continuously fuel Blasting Station's artillery. Every time Fiend Hunter enters the battlefield to exile Metamorphosis Fanatic, it leaves behind a dangling trigger that brings the Fanatic right back, which in turn immediately loops to pull Fiend Hunter back from the graveyard. Meanwhile, Blasting Station happily untaps during every single entry to provide the sacrifice outlet that keeps the engine spinning, converting this perpetual motion into an endless barrage of lethal damage.