Veigar's Passive is one of the most boring and least interactive Passive out there...
It's up there with Heimer's Passive even. It's a Passive that could EASILY be done out with some simple adjustments to mana/regen/mana costs.
You had the perfect chance to make it more interesting, and..........YOU LEFT IT AS IS?!
(on the bright side, the Q and stun changes are definitely welcome)