Indeed, I was thinking about a Permanent with the same effect.
The most important reason for a creature is to counter teh Ghostmare/Nightmare decks. In most cases, if a deck has Nightmare it also has Steal too and your Permanent is gone.
Frankly, as I wrote it in another topique, in my opinion Ghostmare is the most annoying deck. It's not the Ghosts. It's the support cards – most Ghostmares have massive Creature and Permanent control (Rewind and Steal), plus, the damage output of the Ghost is high too. You can lose due to many ways. Such a creature can help a bit, I think. (As a balance, it has mediocre Attack, especially compared to the price.)