I see that there are a lot of cards designed to hose certain actions, such as Enchanter's Wardstone, Armor Ward, Nullify, Jinx, and Reverse Magic. To some extent Dispel and Dissolve are also hosers, keeping a check on enchantments and equipment. Having tools to fight a certain kind of play keeps the game in balance. Magic does this very well with a variety of different cards. One of my favorite Magic hosers ever is Meddling Mage, a creature where when you put it into play, you name a card and that card can no longer be played. I draw that as inspiration for:
(2)(2) Forget (0-2) Mage (Mind 2)
When you reveal Forget name a spell. The enchanted Mage may not cast that spell.
I'd expect Teleport to be the most named target, but I bed there'd be other interesting choices. This is also sort of intended to be an anti-Mage Wand.