Putrid Goblin, Sling-Gang Lieutenant, and Zameck Guildmage

Prerequisites

• Putrid Goblin on the battlefield
• Sling-Gang Lieutenant on the battlefield
• Zameck Guildmage on the battlefield
• available

Steps

1. Activate Zameck Guildmage's first ability by paying
2. Activate Sling-Gang Lieutenant by sacrificing Putrid Goblin
3. 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 Zameck Guildmage
4. Resolve the Sling-Gang Lieutenant ability
5. Repeat from step 2

Results

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