Ok so I am sure this has probably been mentioned sometime before, if its a repost I am sorry. Trying to rebuild my rep after my profile was wiped down to 0...still dont know why :\
So moving on, at the moment everyone knows Retadins are retardedly OP, and one of the favorite combos on Beta was Ret/Unholy DK.
Unholy DK's have alot of AoE abilties, and one particularly that can cause a severe amount of graphical slowdown in arenas. (One where they turn the ground into disease or w/e).
I know blizz was trying to fix the lag it was causing, but as of 2-3 weeks ago on Beta it was still causing slowdown.
So we tried 2 unholy DK's and tried to stack on top of each other as much as possible, the combo is decently strong in itself...no OP outrageous one, but a few times we noticed after we really started cranking out abilities combined with double our ground effect, our opponents often crashed.
I crashed only once, my partner about 3 times. But anytime we crashed both of the opposing team seemed to lag out, free win!
Like I said not really something you can repeat on a regular basis, and I hope bliz does fix the graphic problems Unholy DK's can cause. But if not, why beat with skill when u can just crash :P