Intruder Alarm, Stonybrook Schoolmaster, and Glare of Subdual

Prerequisites

• Intruder Alarm on the battlefield
• Stonybrook Schoolmaster on the battlefield
• Glare of Subdual on the battlefield

Steps

1. Activate Glare of Subdual by tapping Stonybrook Schoolmaster, targeting Stonybrook Schoolmaster
2. Stonybrook Schoolmaster triggers, creating a 1/1 Merfolk Wizard creature token
3. The Merfolk Wizard enters the battlefield, triggering Intruder Alarm, untapping all creatures
4. Resolve the Glare of Subdual ability, tapping Stonybrook Schoolmaster
5. Stonybrook Schoolmaster triggers, creating a 1/1 Merfolk Wizard creature token
6. The Merfolk Wizard enters the battlefield, triggering Intruder Alarm, untapping all creatures
7. Repeat

Results

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