The top layer, the disguise for the ditto, is not tournament legal, however the Ditto card itself is, and has a pretty unique ability called Sudden Transformation, which allows this card to use any attack of a basic Pokemon in the Discard pile
Sneaky opponents can mislead you with what they show in a Blackmail
Pokemon Trading Card Game XY Steam Siege Common Ponyta #16 Pokemon Trading Card Game XY Steam Siege Common Ponyta #16 IN STOCK Estimated ship date $0.75 NOTIFY ME WHEN AVAILABLE Email address submitted
Prismatic felt more all or nothing
MtG Trading Card Game Guilds of Ravnica Uncommon Inspiring Unicorn #16 MtG Trading Card Game Guilds of Ravnica Uncommon Inspiring Unicorn #16 IN STOCK Estimated ship date $0.35 NOTIFY ME WHEN AVAILABLE Email address submitted
Chart shows the price of Mjolnir, Hammer of Thor #146 at the end of each month going back as long as we have tracked the item.