Goblin Bombardment, and Warden of the Grove

Prerequisites

• Goblin Bombardment on the battlefield
• Warden of the Grove on the battlefield

Steps

1. Activate Goblin Bombardment by sacrificing the persist creature
2. When the persist creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. When the persist creature enters, Warden of the Grove triggers, putting a +1/+1 counter on the persist creature
4. Resolve the Goblin Bombardment ability
5. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite damage
• Infinite death triggers
• Infinite sacrifice triggers