Psion said:I think you remember incorrectly. White dragons were the weakest spellcasters in core pre-3e, and even they got spellcasting, meager though it was (IIRC, the oldest white dragon got 4 1st level spells.)
1E Monster Manual, p. 31-34:
Black Dragon -- Chance of: Speaking 30%, Magic Use 10%, Sleeping 50%
Blue Dragon -- Chance of: Speaking 60%, Magic Use 30%, Sleeping 30%
Green Dragon -- Chance of: Speaking 45%, Magic Use 20%, Sleeping 40%
Red Dragon -- Chance of: Speaking 75%, Magic Use 40%, Sleeping 20%
White Dragon -- Chance of: Speaking 20%, Magic Use 5%, Sleeping 60%.
So that's an average of only about 20% chance of evil dragons in 1E casting spells. Only 1-in-20 for white dragons.
And worse, in the fine print on p. 30, first full paragraph, it actually says you need to roll for both a speaking, and then magic-using dragon, to actually get one. That would reduce overall magic use to only 12% average for evil dragons, by-the-book.