Tornadus EX isn't that good. Thundurus does it's job just as good, you can use it without risk in the mirror, and it has more hp per prize (CMT needs a PP and Tornadus EX (free 2 prizes) or to initiate the Mewtwo war, Darkrai needs a Dark Claw). If you can get an Eviolite on it, at best both decks can two shot it (Except for 3 energy on Mewtwo and a PP).