User blog comment:InvictusKris/Buddyfight Summer-Fest Tournament Discussion: Ban List Poll/@comment-28153203-20160606143505/@comment-1755882-20160609094811

Yes, it would cripple them. Shadow Shades in and of themselves aren't all that strong. They have low defense, and their effects only end up as worthwhile because of their spells. Limiting any of the spells would completely cripple the deck.