Putrid Goblin, Sling-Gang Lieutenant, and Cayth, Famed Mechanist

Prerequisites

• Putrid Goblin on the battlefield
• Sling-Gang Lieutenant on the battlefield
• Cayth, Famed Mechanist on the battlefield

Steps

1. Activate Sling-Gang Lieutenant 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, its fabricate ability triggers, putting a +1/+1 counter on itself
3. Resolve the Sling-Gang Lieutenant ability
4. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite lifegain triggers
• Infinite lifegain
• Infinite lifeloss