Seriously? how? This has to be THE most terrifying champion in dominion. He's everywhere, then when you think you got him, he's nowhere. His DPS is high, and he can reposition himself ALL the time in teaam fights, which is really frusterating in dominion because he can blink pretty much over any freakin wall.

stab yourself in the eyes so you cant see him nuke while building fulltank
stab yourself in the ears so you cant hear him riftwalking away with 5 hp
stab yourself in the nose, so you cant smell your tears or rage
stab yourself in the tongue, so you cant taste your blood when you are biting yourself due to your... oh wait.
stab yourself in the hands, so you can wait for ranked dominion to ban that ***** out.

If you can't beat them, join 'em.

Kass Hard 2: Kass Harder

AD carries do well against him. He wouldn't be a problem if they were even remotely viable on this map.

Mo Fiora, Mo Blitz

AD carries aren't viable, eh FDru?

Then I guess all those Ezreals, Kog'maws, Vaynes, Kayles, Urgots, and other assorted carries that have been fielded in the DD tourney were all for show, right?

A good kassadin is basically unstoppable.

You hope Kassadin makes a positioning mistake and then you chain CC him.

You could start by nerfing the passive mana regen on this map? Let's see if that helps a bit...

A fellow named Talon comes to mind...