Too strong.
3 attack is 12 with Adrenaline and 6 HP is a very strong protection. If your opponent plays mono Aether and has a Dim Shield and 2 Phase Dragons out, one of this with Adrenaline kills both Phase Dragons in one turn.
(Maybe you don't want the ability to be able to work against immaterial creatures (which would be a mistake imho), but it's the same for any other opposing element)