But there is nothing in the rules that prevents any old shaman from trying to find a snow spirit and capturing it. You don't need a Lord of Snow Tradition ability, you don't even need a Lord of Snow big spirit.
I see the nomads using these Praxian spirit cults as a way to get unique and strange abilities outside of thier normal traditions. If you think the affinity idea in the HW rules sounds too theistic just change it to spirits/fetishes.
Shaman learns about a powerful spirit. He attempts to meet with it, learns the rituals, goes to sacred place etc. Meets with the spirit and successfully interacts with it, gains any limitations/geases it has. Goes away with its special power either as an integrated spirit (effectively the same as an affinity anyway) or in a fetish.
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