Mikaeus, the Unhallowed + Goblin Bombardment + Scuzzback Marauders

Mikaeus, the Unhallowed

Goblin Bombardment

Scuzzback Marauders

How it works

1. Activate Goblin Bombardment by sacrificing Scuzzback Marauders.
2. When Scuzzback Marauders 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 Scuzzback Marauders.
5. When Scuzzback Marauders 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.