While the stats boost isnt incredible or anything, adding Trample does mean it will be nice to put on medium to large creatures, and the fact that you get a 1/1 goblin when you play it is quite nice, really making up for the other inefficiencies
Sure, the creature sacrifices itself at the end of the turn, but attacking and forcing your opponent to sacrifice most of their board is usually enough to put you ahead and win the game
Earthquake could see situational play in certain decks, but overall, there are more effective options available for achieving similar outcomes
Collecting in the Pokemon Trading Card Game is mostly fed by the the booster packs, but you can also find opportunities to trade with characters in game, the cards featured drawn from the real life Base Set, Jungle, and Fossil card sets as well as some Promotional cards and ones unique to this game