Putrid Goblin + First Day of Class + Goblin Bombardment

Putrid Goblin

First Day of Class

Goblin Bombardment

How it works

1. Cast First Day of Class by paying 1, causing all creatures that enter the battlefield under your control this turn to get an additional +1/+1 counter put on it.
2. Activate Goblin Bombardment by sacrificing Putrid Goblin.
3. Putrid Goblin's persist ability triggers, returning itself from your graveyard to the battlefield with a -1/-1 counter on it.
4. Putrid Goblin enters the battlefield, triggering First Day of Class, putting a +1/+1 counter on Putrid Goblin.
5. Resolve the Goblin Bombardment ability from step 2, dealing 1 damage to any target.
6. Repeat from step 2.