The cards are from Un-sanctioned, a set of five monocolour (?) precons full of on-cards. The intended gameplay is that you mix two of the precons together to form a two-colour deck and battle it out with another mixed deck.
They have some all-new silver bordered cards, but also have reprints of old silver bordered cards for the first time:
ex:
There's also basic lands, which are a split of foil, nonfoil, full art and non full art.
The full art basics are done in a style mixed with that of the previous unsets:
The non full art basics have a squirrel hidden somewhere in the landscape
This is all memory so parts of it could be wrong