Guile, and Void Mirror

Prerequisites

• Guile on the battlefield
• Void Mirror on the battlefield
• You have a spell in hand you can cast for only colorless mana

Steps

1. Cast any spell using only colorless mana
2. Void Mirror triggers, exiling the spell and casting it from exile without paying its mana cost
3. Repeat from step 2

Results

• Infinite magecraft triggers
• Infinite storm count