Marrow-Gnawer, and Thornbite Staff

Prerequisites

• Marrow-Gnawer on the battlefield
• Thornbite Staff on the battlefield

Steps

1. Activate Marrow-Gnawer by tapping it and sacrificing another Rat
2. When the Rat dies, Marrow-Gnawer triggers, untapping itself
3. Resolve the Marrow-Gnawer ability from step 1, creating a number of 1/1 Rat creature tokens equal to the number of Rats you control
4. Repeat

Results

• Infinite creature tokens
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite death triggers