Stalwart Successor + Goblin Bombardment + Lesser Masticore

Stalwart Successor

Goblin Bombardment

Lesser Masticore

How it works

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