Mikaeus, the Unhallowed + Blasting Station + Dread Tiller

Mikaeus, the Unhallowed

Blasting Station

Dread Tiller

How it works

1. Activate Blasting Station by tapping it and sacrificing Dread Tiller.
2. When Dread Tiller dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3. When Dread Tiller enters the battlefield, it and Blasting Station trigger.
4. Resolve the Dread Tiller 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.