Stonybrook Schoolmaster, Intruder Alarm, and Cryptolith Rite

Prerequisites

• Stonybrook Schoolmaster on the battlefield
• Intruder Alarm on the battlefield
• Cryptolith Rite on the battlefield
• Stonybrook Schoolmaster does not have summoning sickness

Steps

1. Activate Stonybrook Schoolmaster by tapping it, adding one mana of any color
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. Repeat

Results

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