glass
(he, him)
In 3.5 and 3.0 it was whatever your casting stat was. In 2e (and presumably earlier) it was only your Wisdom, and only for Wisdom-based casters (although in those days they called it "memorising" rather than "preparing").Didn’t you also get to prepare extra spells if you had a high casting stat (or maybe it was a high intelligence, regardless of casting stat)?