Seeing as debuffs don't get reset when u enter a arena match, you will want to look for some debuff that buffs you and that doesn't take like a couple seconds.
Well I found a debuff from the quest in grizzlyhills where u have to kill arugal on top of the building in the east. When I got mindcontrolled helping a friend to that quest, I got a 5 minute debuff, iirc, after it, that gave me 1% health and 2% mana every 5 seconds.
Here is the link to wowhead Worgen's Blood - Spell - World of Warcraft, now I haven't rly tried this but I don't see why it wouldn't work.