Do bear in mind the fact that if they were this useful, they'd probably sell for a lot more than 14 til on the Marketboards...

Seriously, though, given the number of times I've seen a group biff a raid mechanic and everyone dies except for the tanks, a combat-ready phoenix down could conceivably allow the group to recover from even that - and that is exactly why I think this will never happen. SE WANTS those failed mechanics to mean the end of the fight. They don't ever want to see a situation where a tricky mechanic can be cheesed just by letting it happen, and having the surviving tanks reconstruct the group afterwards.