Putrid Goblin, Goblin Trashmaster, and Captain Kathryn Janeway

Prerequisites

• Putrid Goblin on the battlefield
• Goblin Trashmaster on the battlefield
• Captain Kathryn Janeway on the battlefield

Steps

1. Activate Goblin Trashmaster 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, Captain Kathryn Janeway triggers, revealing the top card of your library, putting a +1/+1 counter on Putrid Goblin and then putting the card back on top of your library
3. Resolve the Goblin Trashmaster ability
4. Repeat

Results

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