Putrid Goblin, Goblin Trashmaster, and Bioengineered Future

Prerequisites

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

Steps

1. Activate Goblin Trashmaster 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 Trashmaster ability
4. Repeat

Results

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