Putrid Goblin + Surrak and Goreclaw + Goblin Sledder

Putrid Goblin

Surrak and Goreclaw

Goblin Sledder

How it works

1. Activate Goblin Sledder by sacrificing Putrid Goblin
2. When Putrid Goblin dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. When Putrid Goblin enters, Surrak and Goreclaw triggers, putting a +1/+1 counter on Putrid Goblin.
4. Resolve the Goblin Sledder ability.
5. Repeat.

This clever loop relies on the constant interplay between Putrid Goblin and its persist mechanic, which normally fizzles out once a -1/-1 counter sticks around. Surrak and Goreclaw brilliantly bypasses this limitation by triggering whenever a nontoken creature enters the battlefield, placing a +1/+1 counter that immediately annihilates the persist counter through the rules of counter cancellation. Meanwhile, Goblin Sledder acts as the engine's sacrificial outlet, letting you cycle Putrid Goblin in and out of the graveyard indefinitely while growing your board with an arbitrary number of death, enter-the-battlefield, and sacrifice triggers.