If he didn't had the "if you are holding a dragon" he woyld see play buthe does so..
Seems like blizzard were extra cauntionous on making a bgh esque card
As someone who has started messing around with dragon priest, I can attest that it's not that hard to have a Dragon in Hand.
Rend is really good in a dragon themed deck I have also been testing out a dragon priest and always have a dragon in hand when it's time to use Rend. I think most of you that have used him will agree he has a really cool animation too