If we're giving assassins new items and reworks, why not Trickster's Glass
Trickster's Glass could be perfect for an assassin. It lets you disguise yourself as a less threatening character on your team so its more possible to get your burst off and it even has a blink built into it if you want to use it for pure mobility. Just gear the stats to an assassin and it should work.
Also Trickster's Glass is the most fun item ever.
oh look, Soraka is all by herself
ults and kills tf
hey a free kill

or
, you have to guess which of 2 is the real one.
, you have to guess which of **5 ** is the real one.
:Oh, a 200 HP all alone Ashe. I can kill her easily.
:SURPRISE MOTHERFUCKER!