Cauldron of Souls + Corridor Monitor + Verdurous Gearhulk + Goblin Bombardment

Cauldron of Souls

Corridor Monitor

Verdurous Gearhulk

Goblin Bombardment

How it works

1. Activate Cauldron of Souls by tapping it, giving Verdurous Gearhulk and Corridor Monitor persist until end of turn.
2. Activate Goblin Bombardment by sacrificing Corridor Monitor.
3. When Corridor Monitor dies, its persist ability triggers, returning itself from your graveyard to the battlefield with a -1/-1 counter on it.
4. When Corridor Monitor enters the battlefield, it triggers, untapping Cauldron of Souls.
5. Activate Goblin Bombardment by sacrificing Verdurous Gearhulk.
6. When Verdurous Gearhulk dies, its persist ability triggers, returning itself from your graveyard to the battlefield with a -1/-1 counter on it.
7. When Verdurous Gearhulk enters the battlefield, it triggers, putting a +1/+1 counter on itself and Corridor Monitor, and two +1/+1 counters on any other creature(s) you control.
8. Resolve both Goblin Bombardment abilities, dealing 2 damage to any target.
9. Repeat.

This clever loop turns the graveyard into a revolving door by leveraging Cauldron of Souls to grant persist to both Corridor Monitor and Verdurous Gearhulk. As each creature dies to Goblin Bombardment's sacrifice outlet, persist returns it to the battlefield with a -1/-1 counter, but the entering triggers counteract this: Corridor Monitor untaps the Cauldron for reuse, while Verdurous Gearhulk distributes +1/+1 counters that immediately cancel out the -1/-1 counters via state-based actions. This dance generates infinite damage and death triggers, continuously resetting the creatures' counters so they can persist indefinitely.