Not only are Mirrorjade's attack and defense high at 3,000 and 2,500, respectively, but its ability to banish an opponent's monster by simply sending a Fusion Monster mentioning Fallen of Albaz to the Graveyard is also incredibly useful
Swarm your field with Amazoness cards, and keep his Blackwings out of the duel
That said, there are various freebies each day so, if you're willing to wait, you'll still have access to a decent chunk of the experience without paying - so far at least
But its essential
Furthermore, the set bears a unique set symbol, a detailed palm tree, and lacks traditional rarity symbols like circles or stars because the distribution was fixed
Whatever the reasoning is, the end result is Pokmon TCG vending machines getting phased out to some degree