Bork has to be bad because it does too many things
Attack speed attack damage lifesteal OnHit slowing nuke passive.
Split that shit up.
Drop the OnHit damage. Focus it on its active effect. Maybe an extra slow on the Energize effect. And make Energize a unique NAMED PASSIVE while we're at it.
%HP physical damage. Incorporate the Dirk passive. Kill a minion, you next basic attack against an enemy champion gets bonus damage. Kill an enemy champion, your basic attacks get aforementioned bonus damage for (duration) seconds.
, you can't use multiple Shiv Lightning Passives because Shiv Lightning is UNIQUE.
doesn't need a nerf, nor a split. I don't think you know how "Gold vs. Power" works, do you?