If I have a creature, with two different totem armors on it, and it's destroyed somehow (not sacrificed, not killed by -x,-x effects) what happens? Are both totem armors destroyed to save it, or just one? Can I choose which one?
Per the Gatherer ruling (for Bear Umbra, not that it matters really):
If a permanent you control is enchanted with multiple Auras that have totem armor, and the enchanted permanent would be destroyed, one of those Auras is destroyed instead -- but only one of them. You choose which one because you control the enchanted permanent.