This card will take a lot of energy to get up to full power, however, when it does, it can be useful for a pretty unique and destructive strategy
Of course, this card goes best in decks that want to disavow the one land per turn limitation via cards such as Uro, Exploration, Azusa, Risen Reef, or any other land-ramping cards that run rampant through Commander
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coupled with its lower damage output (160 damage) and heavier KO penalty (like all EX Mega Pokmon, Mega Latios EX being KO-ed instantly costs you the match), this makes it very undesirable to use seriously