New Mastery [SUGGESTION].
Arcane Blade: Deals 5% of your AP as an on-hit magic damage on your AA. [NOTE: Replaces Runic Affinity: Buffs from neutral monsters last 15% longer.]
So basically: Mastery 1 (Runic Affinity): Mages; helps last hitting. Mastery 2 (Secret Stash): AD carries, Supports, Junglers. Mastery 3 (Assasin): Mid laners, Top laners; helps dueling.