Stalwart Successor + Blasting Station + River Kelpie

Stalwart Successor

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 Stalwart Successor trigger.
4. Resolve the River Kelpie trigger, causing you to draw a card
5. Resolve the Blasting Station trigger, untapping it.
6. Resolve the Stalwart Successor trigger, putting a +1/+1 counter on River Kelpie
7. Resolve the Blasting Station ability from step 1.
8. Repeat.