I was looking up random stuff and ended up at the Darkmoon Faire cards. I saw one of the older ones called Twisting Nether.
Darkmoon Card: Twisting Nether - Items - World of Warcraft
You have a 10% chance to rez with 20% HP and Mana.
This still works in arenas!
This could help a TON in the lower brackets (maybe the higher brackets but I am sure you just get better trinkets.)
Healer- Dies (Spirit of Redemptions if they are holy priest) resurrects and can throw off some quick heals to maybe win the game.
DPS- Rez and can do some massive damage with 20% mana(for mana based DPS)
This will also screw up bigger teams because they won't even notice you until you come back and hit them with some massive damage or heal some teammates.