When determining the school of a spell during the game (NOT during spellbook construction), does a spell with multiple choices for the spell school (such as [mwcard=MW1Q08]Elemental Wand[/mwcard] or [mwcard=MW1Q09]Enchanter's Ring[/mwcard]) count as being all of its spell schools, or only the one that was chosen for spellbook construction?
For instance, suppose I am a necromancer, and have equipped an elemental wand. So far, so good. Then you play a card (let's call it "Baleful Resonance") that gives all Earth spells the Upkeep +1 trait.
If the wand is treated as counting as all four elemental schools at once, then no problem; it gains upkeep +1 because it counts as an Earth spell.
But if it only counts as the school that I chose during spellbook construction, we have a bit of a problem. Being lazy, I had seen that all four school choices cost the same, and therefore did not bother choosing. So I have no idea what school it is.
Even if I had chosen a school, keeping track of which one it was is an undesirable burden.
So does the wand count as all four elemental schools simultaneously, then? I assume it does, but I want a ruling so that I can be sure.