Dammit, I've been tossing around "shrink" ideas but I rather like this.
Honestly what I like best about this card is the norm-upgraded progression.
It's an entire change of skill and both cards effectively act independant of one another.
You could easily build decks with use of one or the other.
Hex brings up some interesting strategies: say, your opponent grav pulled one of your creatures, turn it into a voodoo doll for a couple of turns!
Opponent spamming dragons? Voodoo this!
Though I have an interesting proposition, perhpas hex turns the creature into a frog? hmmm...