Mikaeus, the Unhallowed, Woodfall Primus, and Goblin Bombardment

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Woodfall Primus on the battlefield
• Goblin Bombardment on the battlefield

Steps

1. Activate Goblin Bombardment by sacrificing Woodfall Primus
2. When Woodfall Primus dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. When Woodfall Primus enters, it triggers, destroying a noncreature permanent
4. Resolve the Goblin Bombardment ability
5. Activate Goblin Bombardment by sacrificing Woodfall Primus
6. When Woodfall Primus dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
7. When Woodfall Primus enters, it triggers, destroying a noncreature permanent
8. Resolve the Goblin Bombardment ability
9. Repeat

Results

• Destroy any number of noncreature permanents
• Infinite ETB
• Infinite LTB
• Infinite damage
• Infinite death triggers
• Infinite sacrifice triggers
• Lock