Mikaeus, the Unhallowed + Blasting Station + Wingrattle Scarecrow

Mikaeus, the Unhallowed

Blasting Station

Wingrattle Scarecrow

How it works

1. Activate Blasting Station by tapping it and sacrificing Wingrattle Scarecrow.
2. When Wingrattle Scarecrow dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. When Wingrattle Scarecrow enters, Blasting Station triggers, untapping Blasting Station.
4. Resolve the Blasting Station ability from step 1.
5. Activate Blasting Station by tapping it and sacrificing Wingrattle Scarecrow.
6. When Wingrattle Scarecrow dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
7. When Wingrattle Scarecrow enters, Blasting Station triggers, untapping Blasting Station.
8. Resolve the Blasting Station ability from step 5.
9. Repeat.