B2B Live TBC 2.4.3

have tested this with Black Magic enchant for total of 24 hours over a span of a week and there seems to be a 15sec internal cooldown but not shared cooldowns. I've had both proc one after the other, proc at the same time, or even, in rare instances, not proc at all for 30sec.

https://www.wowhead.com/item=31336/blade-of-wizardry#comments:id=1041974

[Ashtongue Talisman of Insight] - various procs depending on class, no cooldown

https://web.archive.org/web/20080902015323/http://elitistjerks.com/f15/t11325-procs_without_internal_cooldowns/