Hex of Weakness in Arena?Follow

I've been hearing how effective Mortal Strike and Wound Poison are in the Arena, and that makes me wonder if any Troll Priests have tried using Hex of Weakness in there. Level 1 HoW is an instant spell with no cooldown that reduces all healing on the target by 20% for two minutes for just 35 mana. Furthermore, it's a curse, so the only healers that can get rid of it are druids (as opposed to pallies, shammies and druids for Wound Poison). You could spam level 1 HoW on the enitre opposing team pretty darn fast for very little mana, cutting their heals considerably with no downside other than the global cooldowns. Seems better for the arena than Devouring Plague, which though I love it costs a ton of mana and is easily dispelled.