Putrid Goblin + First Day of Class + Goblin Sledder

Putrid Goblin

First Day of Class

Goblin Sledder

How it works

1. Cast First Day of Class by paying 1
2. Activate Goblin Sledder by sacrificing Putrid Goblin
3. When Putrid Goblin dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
4. When Putrid Goblin enters, First Day of Class triggers, putting a +1/+1 counter on Putrid Goblin.
5. Resolve the Goblin Sledder ability.
6. Repeat from step 2