For three mana, Captivating Vampire is an extremely strong card, and especially so when paired with any of the myriad ways for you to gain multiple Vampire creature tokens
Luckily, there are plenty of cards that can help you on that front
Similarly, Fraying Sanity milling twice the amount of cards on the enchanted player means that even a smaller mill spell can spiral out of control
You dont really care about Michelangelo dying
I see the power here, but in a game thats been power crept since Coldsnap (?!??), a 6-drop that opponents have to decide they let trigger seems like a terrible deal
The constant stream of free spells off the top of your deck is just too much value for your opponent to deal with, and the ability to hit your opponent for 10 life with Kefka's Tower shouldnt be underestimated either