Belisarius Cawl, and Intruder Alarm

Prerequisites

• Belisarius Cawl on the battlefield
• Intruder Alarm on the battlefield
• Belisarius Cawl does not have summoning sickness
• You control at least two other untapped artifact creatures

Steps

1. Activate Belisarius Cawl's first ability by tapping it and two other artifact creatures you control, creating a 2/2 Astartes Warrior creature token
2. The Astartes Warrior enters the battlefield, triggering Intruder Alarm, untapping all creatures
3. Repeat

Results

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