Mikaeus, the Unhallowed + Blasting Station + River Kelpie

Mikaeus, the Unhallowed

Blasting Station

River Kelpie

How it works

1. Activate Blasting Station by tapping it and sacrificing River Kelpie.
2. When River Kelpie dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. When River Kelpie enters, it and Blasting Station trigger.
4. Resolve the River Kelpie trigger, causing you to draw a card.
5. Resolve the Blasting Station trigger, untapping it.
6. Resolve the Blasting Station ability from step 1.
7. Activate Blasting Station by tapping it and sacrificing River Kelpie.
8. When River Kelpie dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
9. Repeat steps 3 through 5 once.
10. Resolve the Blasting Station ability from step 7.
11. Repeat.