I have been playing this deck since standard came out, and it works surprisingly well... Dont know if it can be top tier, but with the necessary changes where needed it can be pretty powerful.
I challenge you to try it out! its also pretty fun if you like combo/control!!!
Conceal is there to protect your emperor for 1 extra tick so you can brann into C'Thun in 1 turn, or to protect your brann before you pop C'Thun the next turn... (sidenote: beware of flamestrikes!)
Happy standarding :D