Marrow-Gnawer, and Intruder Alarm

Prerequisites

• Marrow-Gnawer on the battlefield
• Intruder Alarm on the battlefield
• You control at least two additional Rats

Steps

1. Activate Marrow-Gnawer by tapping it and sacrificing another Rat, creating at least two 1/1 Rat tokens
2. Intruder Alarm triggers once for each creature token created, untapping all creatures that many times
3. Repeat

Results

• Infinite creature tokens
• Infinite mana creatures you control can produce
• Infinite untap of all creatures