While searching for live auction data, I found prices in the range of $300 to $600 for good quality copies of the card, but also spotted some PSA 10 copies that were starting to creep into the thousands

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Rares appear roughly once per pack, and mythic rares about once every eight packs
Rooms were designed in such a way that you can use either half without wasting the other, so feel free to run out the Sauna on turn 5 and snipe something down with the Furnace later, or vice versa
This will help inform your choices
Amid the vast cosmos of Pokmon collectibles, the elusive whereabouts of the other copy casts a veil of uncertainty, heightening its mystique