Kyurem-B's typing is one of the biggest hurdles it has to face. In exchange for the Ice neutrality, it has many weaknesses that most other Dragons don't, and its lack of Spikes immunity makes it complete fodder to Deo-D offensive teams. In fact, it misses out on almost everything that makes other OU Dragons awesome. No Spikes immunity, no powerful set up moves, no Mach Punch resistance, no threatening movepool...nothing. All it has is a powerful Outrage and great bulk. The problem is, Dragonite and Garchomp have those things too, amongst others, which makes them solid candidates for A-tier. Kyurem-B can't even do half of the things they can.
Also, the set you proposed is pretty useless. It'll get one hit in at best vs offensive teams then die immediately the next turn. On top of that, its counters are pretty much the same: Jirachi, Scizor, entry hazards of any kind. Outside of a surprise kill, there's no real payoff.
(02:53:55) +shrang: sleep is epic
(16:14) .No Scrafty in UU.: CBtar?
(16:14) .No Scrafty in UU.: that sounds like a not bad set
(16:04:25) +Steamroll: nobody likes me
@Relados: snowflakes has no sense of humor