Putrid Goblin, Bioengineered Future, and Goblin Chirurgeon

Prerequisites

• Putrid Goblin on the battlefield
• Bioengineered Future on the battlefield
• Goblin Chirurgeon on the battlefield

Steps

1. Activate Goblin Chirurgeon by sacrificing Putrid Goblin
2. When Putrid Goblin dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to Bioengineered Future
3. Resolve the Goblin Chirurgeon ability
4. Repeat

Results

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