If you control a Spellcaster-Type monster and your opponent does not, your opponent cannot activate Spell Cards. If you control no Spellcaster-Type monsters, you cannot activate Spell Cards.
(Disclaimer: This card features a 2020 Copyright date.)
Near Mint Unlimited - $0.45
Lightly Played Unlimited - $0.40
Moderately Played Unlimited - $0.35
Heavily Played Unlimited - $0.20
Damaged Unlimited - $0.20