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Stallrein is the sole broken aspect regarding Hail, in my opinion, since it's bulk overdoes it's purposes.
In UU, where the variety of support from team-mates grows, Stallrein is barely viable and I wondered why.
Ofcourse there are more and better Taunt users ,phasers and T-spikes absorbers, but I think the main reason
is the power difference between the tiers. When in higher tiers, it's bulk is lackfull, RU gives it's bulk
place to shine too bright. Other Ice Body users in RU, will struggle to perform the job Stallrein struggles to do
in those higher tiers, due to less bulk and/or worse typing.
Regarding Blizzspam, I think it is just a "new" kid in the neighboorhood that needs to be accounted for when building teams. Each of it's best users (and sets) needs to be handled a bit differently, but still they are rather easy to handle, as much as the tier's other main threats are.