Stalwart Successor + Viscera Seer + Trapjaw Kelpie

Stalwart Successor

Viscera Seer

Trapjaw Kelpie

How it works

1. Activate Viscera Seer by sacrificing Trapjaw Kelpie
2. When Trapjaw Kelpie dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. When Trapjaw Kelpie enters, Stalwart Successor triggers, putting a +1/+1 counter on Trapjaw Kelpie
4. Resolve the Viscera Seer ability.
5. Repeat.