Due to the uncertainty of opening booster packs, accumulating specific cards needed to build a decent deck can be very tricky
Not only does this turn off things like Droplet and Maxx C, but it also shuts off any deck that involves the graveyard (TriZoo, Eldlich, Sky Strikers, Phantom Knights, Sword Soul etc.)
If this spell was cast from your hand, create a 0/1 black Wizard creature token with "Whenever you cast a noncreature spell, this token deals 1 damage to each opponent." Rebound (If you cast this spell from your hand, exile it as it resolves
Hitmontop 067
For one thing, not having to enchant a permanent is huge, as your foe cant remove it in response, and the ability to duplicate any nonland permanent you have as opposed to just a creature or artifact is massively strong