Actually I have noticed quite a few bows out there with magic damage on them. While I've never tried it myself, an arcane archer sort of build should be possible. Perhaps using the same base stat build as the battlemage but wearing gear like the Hunter set and charming DEX and heightened reflexes to make up for the loss of crit damage by going INT instead of DEX could work. I'd imagine Explosive Arrow + Fireball would be pretty devastating. I might just try this out on my next playthrough.