Too bad Mesprit is so awful, otherwise the trio power can be rather fun... 30 damage and auto-sleep can be very irritating. Azelf's power is just downright annoying as a backup, but I honestly don't see what the heck is Mesprit suppose to contribute... it's not like the trio's retreat cost is that high anyway, and teleport blast is so "meh."
Looks fun to play, but I'm not sure if it'll be anything groundbreaking for a combo unless there's some trainer cards to add on to it...