Putrid Goblin, Bioengineered Future, and Clickslither

Prerequisites

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

Steps

1. Activate Clickslither 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 Clickslither ability
4. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers
• Infinitely large creature until end of turn