Grandmother Goby, and Guile

Prerequisites

• Grandmother Goby on the battlefield
• Guile on the battlefield

Steps

1. Cast the noncreature card by paying its mana cost
2. Grandmother Goby triggers, attempting to counter the spell
3. Instead, the spell is exiled and you will cast the spell from exile without paying its mana cost due to Guile
4. Repeat step 2

Results

• Infinite magecraft triggers
• Infinite storm count