When I first saw Ether I kinda had the same idea. I would only suggest maybe choosing some more hefty attackers since turn one 90 is rather impressive, if the defending pokemon is an EX they'll tank the damage and you'll feel incredibly salty when they Max Potion the damage away.
Another issue is that your only attacking pokemon is Cobalion, and in the off-chance of facing a Ho-Oh deck you're screwed.
Another thing is that this deck should ideally be running somewhat like the old Sabledonk deck. Granted you don't have Crobat G to do most of the work for you, a build like this needs to have the ability to run through itself rather quickly to ensure that it's hitting hard and fast turn 1.
Unless you're facing Eels, Tornadus is pretty solid for this concept. Mewtwo can also possibly hit for an insane amount of damage, but it will be impossible NOT to revenge KO, unless your opponent doesn't run DCE, in which case they're in for some serious frustration.