Mecathun taunt druid?

theres no point into trying to get mecathun fast. why fast? it sucks vs aggro and isnt fast enough. its good vs everything else. so i made a taunt version of druid mecathun and have been pwning. i basically added the 10 mana 5/5/5/5 card, nourish, spreading plague, a few taunts. aggro has almost no chance and i still beat the other control or whatever decks.

so why doesnt priest and other mecathun decks do this?