Putrid Goblin, Skirk Prospector, and Bioengineered Future

Prerequisites

• Putrid Goblin on the battlefield
• Skirk Prospector on the battlefield
• Bioengineered Future on the battlefield

Steps

1. Activate Skirk Prospector 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 Skirk Prospector ability
4. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite red mana