Stalwart Successor + Bartolomé del Presidio + Grazing Kelpie

Stalwart Successor

Bartolomé del Presidio

Grazing Kelpie

How it works

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