For PvP minigames I'd go Muti, and I suggest you to put 2 points in Winter's Bite.
Especially after merge it's hard to play vs americans, who have extremely low ping, unless you are lucky enough to have good ping even in Europe.
Unfortunately I'm not lucky, my ping now is near 200ms and that snare helps a lot in minigames (duels are anyway almost unplayable..).
PvE build is ok but I would completely skip Ether Theft.
If you really have mana problems, consider moving 3 points from Brutal Walker to Ursin Spirit.
Ether Theft is very meh combo, especially non fully feated.
Oh and wellcome back! :)
Looking for you in minigames