Tocasia, Dig Site Mentor, Intruder Alarm, and Stonybrook Schoolmaster

Prerequisites

• Tocasia, Dig Site Mentor on the battlefield
• Intruder Alarm on the battlefield
• Stonybrook Schoolmaster on the battlefield
• Stonybrook Schoolmaster does not have summoning sickness

Steps

1. Activate Stonybrook Schoolmaster by tapping it
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 Stonybrook Schoolmaster ability from step 1, causing you to surveil
5. Repeat

Results

• Infinite creature tokens
• Infinite ETB
• Infinite mana creatures you control can produce
• Infinite self-mill
• Infinite surveil
• Infinite untap of all creatures