The eredar were among the most advanced races in arcane magic. And yet, it is surprising that today's draenei mages seem at best only comparable to those of other races, and their mages seem to be far from the majority. There does not seem to be a single significant draenei mage, and I'm not sure if there is any within the ranks of the Kirin Tor.
The gnomes seem to be skilled arcanists as well - they are extremely imaginative and intellectual, optimal traits for most any mage, and they are very commonly found in the ranks of the Kirin Tor, and part of the Council of Tirisfal.
But how do they compare with the night elves and blood elves / high elves, for example? Which race is the most gifted and powerful of the four races? Are they for example, generally more formidable and skilled, than the elves, or are they roughly equal to them in proficiency? Who would in a fight between them, if the draenei and gnomes' mages, for example, joined forces together and attacked those of the elven races?