Their definition of Focused is a deck that is dialed in on its game plan, with most cards in the deck working towards that goal and Optimized being the next step up where decks have more consistent wincons and more interaction
A few rental decks, however, do require multiple cards before they're unlocked such as the Kanto Fossils Deck
Since you're in Jund colors, you have access to a few more spells and creatures that let you increase the power of your creatures when you attack, letting you put your opponents on the ropes
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That said, if you have any inkling of playing Vehicles in the future, you may want to grab a playset or two while theyre still cheap
Some fakes are laughably obvious, while others require a trained eye to identify