Sheen Rework

So with the proposed changes to Sterak's Gage on PBE (that of changing it to bonus AD instead of modifying base AD), I thought just how polarizing Sheen items themselves are; they are really good on anyone with spammable spells, high base AD, and/or AA resets. Not that it is a problem to be really good, but rather it's the inconsistency with modifying base AD instead of something worded like Nasus's Q, like the following:

Spellblade (Sheen version): After casting a spell, next basic attack deals an additional 10-35 physical damage, scaling with level. 4s cooldown.

Sorry for the rushed thought, on mobile and my low priority queue is about finished.