Stalwart Successor, Goblin Bombardment, and Trapjaw Kelpie

Prerequisites

• Stalwart Successor on the battlefield
• Goblin Bombardment on the battlefield
• Trapjaw Kelpie on the battlefield

Steps

1. Activate Goblin Bombardment by sacrificing Trapjaw Kelpie When Trapjaw Kelpie dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
2. When Trapjaw Kelpie enters, Stalwart Successor triggers, putting a +1/+1 counter on Trapjaw Kelpie Resolve the Goblin Bombardment ability
3. Repeat

Results

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