Why not just ban snow cloak? Nobody will be unhappy about that, I presume. I don't think anybody cares about not being able to use Beartic.
Because Snow Cloak alone isn't the problem.
OK, we ban Snow Cloak. Then Cursed Body is released, and Frolass comes back.
We still have to deal with sets like this:
Froslass @ Life Orb
Blizzard
Shadow Ball
Destiny Bond
Filler
It's Froslass which dosen't look as much like Jirachi.
Or, we could still have fun with:
Froslass @ Choice Specs
Blizzard
Shadow Ball
Trick
Whatever you Feel like
Spikes are not the issue, the issue is that it's stupidly easy for Froslass to secure at least one KO, if not through power, through Destiny Bond.
And with that out of the way, things such as Mamoswine, Lapras [BTW, why dont more people use that thing? It's pretty bulky and has a decent movepool], Rotom-F and Glaceon to still deal with.
As well as things like StallRein and SubSeed Abomasnow. All of which are major threats, especially if Froslass takes your check down with it.
The way I see it, banning Snow Cloak is futile, because Blizzspam is just too strong for the teir right now. I'd suggest banning Froslass [Because of Trick/Destiny Bond/Status screwing over checks] or Hail outright to kill Blizzspam.
Evasion is annoying, but I think we can all agree it's not the sole problem, and the only thing it's breaking is Froslass. Mamoswine and Glaceon are not broken, except as part of Blizzpam, backed up by Froslass spreading Paralysis and Spikes like they're Christmas presents.