Prowling Geistcatcher, Karmic Guide, and Goblin Bombardment

Prerequisites

• Prowling Geistcatcher on the battlefield
• Karmic Guide on the battlefield
• Goblin Bombardment on the battlefield

Steps

1. Activate Goblin Bombardment by sacrificing Karmic Guide
2. When Karmic Guide dies, Prowling Geistcatcher's first ability triggers, exiling Karmic Guide from your graveyard
3. Activate Goblin Bombardment by sacrificing Prowling Geistcatcher
4. When Prowling Geistcatcher dies, its second ability triggers, returning Karmic Guide from exile to the battlefield
5. When Karmic Guide enters the battlefield, it triggers, returning Prowling Geistcatcher from your graveyard to the battlefield
6. Resolve the Goblin Bombardment abilities from step 1 and step 3, dealing 2 damage to any target
7. Repeat

Results

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