Guile, and Cephalid Shrine

Prerequisites

• Guile on the battlefield
• Cephalid Shrine on the battlefield
• You have any spell in hand with the mana to cast it

Steps

1. Cast any spell
2. Cephalid Shrine triggers, choose not to pay for the trigger, 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