I always wondered what was behind the square on the Pokemon card
Thus, we can safely assume there will be over 150 secret rare cards in this set
its ATK/DEF become double its original ATK/DEF, until the end of this turn, but it cannot attack your opponent directly this turn
As a result, it may be the most popular of the Groot-themed Secret Lair cards
Most (in)famous of all is Thracia 776's Reinhardt, a one-map-wonder NPC boss from arguably one of the most obscure games in the franchise, who ended up becoming a symbol for the entire game due to being an unintended Game-Breaker early on
While not 100% foolproof, this day in age I would just recommend getting a PSA graded example unless you truly want a raw card and know with certainty the auto is real (in person event, a friend of yours you trust, etc.)