holy shit i feel like that just might break him. his mana isnt that much of a problem, although it is a bit high. having his W interact with this passive in such a way enforces using his AA far more than he already does and that interaction is pretty badass(although i dont usually focus on AA, just shooting a full powered q without hitting any minions hurts like hell early levels with i.e and last whisper rushed). and that E slow with the movement speed boost would make him much more safe. not to mention it on his E and Q for chasing.....AND his W hitting armour spamming tanks for ap damage he is really not that bad against tanks which is the meta these days
if this goes out i will bet on my 14 year old gameboy advance he will be used in the LCS
imo varus def needs something but not to this level