It has potential to stomp a good chunk of the teams out there, but when you get past 1600 rating it'll be really tough without a healer even with team healing rune taps. I play melee in arenas and one of the biggest problems is how easily a blessing of protection can ruin your burst - and they always know who you are trying to kill because you are melee and have to have your victim targeted.

Hungering cold with 10 diseases on each target just eating away at them for 10 or 5 seconds would be devastating though - when it worked.