[pet]Lil' Deathwing[/pet] - This tiny Aspect of Death is just as destructive on the pet battlefield as his much larger, less adorable counterpart was on the entirety of Azeroth. He is a miniature powerhouse of twisted metal and charred scales, so put him on the attack and never let up.
Use
Roll whenever it is needed for that damage boost
(make sure you anticipate when it is going to drop off so you don't go a turn without it) and use
Tail Sweep over
Shadowflame as, overall, it puts out more damage - Li'l D isn't exactly the swiftest lizard and will likely be last, but if he happens to be swifter than his opponent then the sacrifice is only a small loss of damage; it's worth it, trust me.
Finally, follow up everything with a nice, fiery
Cataclysm to devastate your opponent. Yes, it does have a high chance of missing but, in my experience, it hits more often than not and will utterly obliterate pretty much anything - especially with the damage boost from
Roll. Plus, it only has a 1 round cooldown. If it doesn't outright kill an opponent, it will take off a decent chunk of damage unless, of course, the opponent is Undead.
A particularly devious use of
Cataclysm is to make sure that Li'l D has his damage boosted from
Roll, then order him to kill the opponent's frontline pet, which will trigger the Dragonkin's passive ability; dealing 50% extra damage on the next turn after bringing an opponent's HP below 25%. Both of those damage boosters combined will then make
Cataclysm extra deadly to the next pet brought out. The ability also works as a nice finisher to knock off that last chunk of health from an opponent that just refuses to die.
You can also pair up Li'l D with the
Gilnean Raven. They have a beautiful friendship - D with his
Elementium Bolt (cast that first), then
Call Darkness. Switch him out, and bring on the dark omen.
Call Darkness makes every pet on the field Blind, which means the raven's high-damage attack
Nocturnal Strike will always hit. Start with that and set up
Darkflame or just swoop at them with
Alpha Strike (considering the raven's high speed, it is likely to hit first the majority of the time, dealing extra damage) until
Nocturnal Strike is off cooldown or Li'l D's bolt flies back into the picture to land the final soul-destroying blow.
Then sit back, steeple your fingers and allow yourself a villainous grin.
You have a miniature Deathwing at your disposal.
You control death itself.