Intruder Alarm, Harmonized Trio // Brainstorm, and Deekah, Fractal Theorist

Prerequisites

• Intruder Alarm on the battlefield
• Harmonized Trio // Brainstorm on the battlefield
• Deekah, Fractal Theorist on the battlefield

Steps

1. Activate a creature by tapping it, adding at least
2. Activate Harmonized Trio by tapping it and two other creatures you control, causing it to become prepared
3. Cast a copy of Brainstorm by paying
4. Deekah triggers, creating a creature token
5. When the creature token enters, Intruder Alarm triggers, untapping all creatures
6. Resolve Brainstorm, causing you to draw three cards and put two cards from your hand onto the top of your library
7. Repeat

Results

• Infinite card draw
• Infinite draw triggers
• Near-infinite ETB
• Near-infinite creature tokens
• Near-infinite magecraft triggers
• Near-infinite storm count
• Near-infinite untap of all creatures