You get a foil promo card featuring Charizard-GX, able to hold its own with the very bestand to add a bit of extra heat to your collection
By farming all available missions, you should be able to accumulate a solid amount of Pack Hourglasses to open an extra 1-3 Booster Packs per day at minimum, or even up to 10+ booster packs, depending on how many missions you still have available at the time
I think this one will hold its price fairly well, especially if it makes it into a tier one or two deck, which is quite likely for a land that can trivially make 2 mana
It can also get you out of a particularly scrappy combat that would otherwise knock you out of the game
Double-faced cards previously had a limitation though, which was always to play the front face of the card and then transform into the back face
Set: HeartGold & SoulSilver: Base Set Sealed Release Date: 2010-05-12