Yeah, Curve is solid
because it counts instants and sorceries you have exiled as well.
On a similar (albeit non-blue) note, may I interest you in a
?
EDIT: Is judging cards based on how well they "curve out" really appropriate when looking at cards for a "spells" deck? I've always associated that term with more permanent-heavy decks, since their cards naturally stick around (meaning you get more value out of playing them "on time"). I always end up looking at "spells" cards with the idea that you're generally not looking to tap out when you're playing them.
It gets even more confusing when you're looking at cards like Academy Elite et al, where they give you more value the
later you play them. I read them as a way to make a "spell velocity" plan survive the transition into a top-deck war — those cantrips and enablers you spent liberally earlier in the game mean that Serpentine Curve (or whatever) topdecks as a big ol' fatty.
...
I feel like a thread on how to evaluate cards for different archetypes, based off of the game plans of those decks, could be a good time...