Mikaeus, the Unhallowed + Blasting Station + Dream Seizer

Mikaeus, the Unhallowed

Blasting Station

Dream Seizer

How it works

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