Secret Village of the Spellcasters (LDK2-ENY33) - Legendary Decks II (2024 Reprint) Unlimited

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.)