Both umbral and ghostblade providing AH. There will definitely going to be a power creep, but say whatever you want. Even the blind can see it. Mages has a single haste item in their entire legendary roster, meanwhile ad has haste on almost all of their items. Sounds fair.
Assassins are a special case. It is a conscious choice to give them haste and utility effects in the legendary item passive so that they have less item power budget in Burst damage. Mages have 3 haste items in their legendary roster.