and then, you do 120 damage a turn. Whoop-dee-doo.
it isn't enough to 1HKO most attackers, so you'll be doing a 2HKO on them, which is frankly, quite bad for a setup requiring 8 energies, 2 EX's a stage 1 and a stadium.
Yeah, even Zekrom does the same thing without that huge setup. The only thing that Kyurem has over its dragon brethren is that it is harder to OHKO, although Mewtwo still only has to get 5 energy...
There is also the option of just damaging one and then Catchering it for the kill.
Uh, Stage 2 is not in any way superior to Basic...but yeah, in this format, the combo is useless. (also pretty obvious too, just not used because its not worth it).
My mistake, I was remembering Giga Impact as needing CC not CCC. I'd take a Stage 2 that only needs one DCE over a Basic that needs three turns of accelerationless energy drops any day, at least for this concept.
It isn't a great idea, but it does have a point to it. If you ran a Few Shaymin, seekers, and vileplume, you could keep Kyurem EX alive for a ton of time.