Since no one have give you a strat yet, I will give you my strat against retri's =)
1. when duel start spam the CS as fast as you can to prevent stun, then you sheep (take care if he trinkets) now you spell steal all his trash buff's.
2. When u have totally stealed him, puff ur burst cd's and nuke his ass (with slow on ofc.) now he will probably cast hof otherwise his forced into early bubble. well now you just easy spell steal it and /laugh =)
It's very important u recast ur slow when hof is off, even if u have to interupt one of ur own arcane blast, his not allowed to get close to you, especially not as arcane. Two very important things: BLINK ONLY WHEN HE USES HAMMER OF JUSTICE, TRINKET HIS REPENTANCE!!! VERY IMPORTANT!!!.
3. when he bubbles you just instant invis and go to a save place and evo, and get back on him with same rotation --> CS --> sheep --> spell steal --> nuke, spell steal, slow.... knockout!!!
I know this strat seems so fukin obvious for the pro's, but since his has so many problems I went to details

and btw. I play as frost, but this worked fine when I was arcane.