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In Japanese Set and Draft Boosters, each time you get a Mystical Archive card, it is a 50% split of being either the global version (printed in the Japanese language) or the Japanese alternate-art version (which is always exclusively in Japanese language)
Considering it is such a staple, it's usually a little pricey, and this reprint (especially the fancier versions) is no different
This attack does 30 more damage for each heads
In Legacy, the card is best in Eight-Cast, which is focused on playing lots of cheap Artifacts to maximize the power of Urzas Saga and both draw spells, Thought Monitor and Thoughtcast
It can't just stay undefined, so if Shellephant is going to be on the battlefield or something needs to know its power or toughness, you should activate the ability to define it