TCG is played in turns that follow a specific order of operations
Back in 1999, when Pokemon became a thing, the card had almost no value
If Palkia-GX uses it, the opponent is forced to shuffle every single Energy card attached to their Pokmon back into their deck
Destroy this card unless all 5 of these cards are in your GY, "Exodia the Forbidden One", "Right Arm of the Forbidden One", "Left Arm of the Forbidden One", "Right Leg of the Forbidden One" and "Left Leg of the Forbidden One"
Trading Card Game , because this game was produced at the same time as the card game was being adapted from the manga, so the rules used are some one of the original rules considered for the TCG
Combined with resource-recycling cards of its era, it created a near-unbreakable loop that made it one of the most frustrating and powerful cards ever printed