Stalwart Successor, Goblin Bombardment, and Putrid Goblin

Prerequisites

• Stalwart Successor on the battlefield
• Goblin Bombardment on the battlefield
• Putrid Goblin on the battlefield

Steps

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

Results

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