Stalwart Successor, Goblin Bombardment, and Grazing Kelpie

Prerequisites

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

Steps

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

Results

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