During the End Phase, shuffle that card into your Deck, and if you do, take damage equal to that monster's Level x 200
So despite this being just a Basic Energy card, not known for holding their value, perhaps the gold variants scarcity, along with the fact that its now a defunct Energy type, has contributed to it holding a pretty high value
It introduces 103 new cards to the popular trading card game, including mega evolution cards for the three Gen 1 starter Pokemon, Charizard, Venusaur, and Blastoise
I do think a lot of these cards need haste because you only have a single opportunity to swing with them and then they are gone, but maybe that final trigger is more than enough
It also includes a double-sided Dueling Guide/Deluxe Game Mat and beginner's guide
So please update to the latest information