Mikaeus, the Unhallowed + Goblin Bombardment + Persistent Constrictor

Mikaeus, the Unhallowed

Goblin Bombardment

Persistent Constrictor

How it works

1. Activate Goblin Bombardment by sacrificing Persistent Constrictor.
2. When Persistent Constrictor dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. Resolve the Goblin Bombardment ability.
4. Activate Goblin Bombardment by sacrificing Persistent Constrictor.
5. When Persistent Constrictor dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
6. Resolve the Goblin Bombardment ability.
7. Repeat.