Behold! For thou hast asked for mine thinks on such subjects as hit, crit and haste. Forsooth! Dost I now bequeath such knowledge upon thee, and so forth.
Spell Hit and the Hit Cap
A little chart:
Outright stolen from WoWWiki.
As a raiding mage, you will need, via gear, talents, raid buffs, whatever, a boost of 17% to your spell hit rating. Most of this will need to come from gear, though not all of it.
You can gain a 3% to spell hit rate from a raid debuff. Moonkin can provide it via Improved Faerie Fire, and Shadow Priests can provide it via Misery. (more…)