Gatherer is a fantastic resource for finding cards in paper magic, but does not seem to me to contain any way of getting only Duels of the Planeswalkers cards. Neither the Expansion, Format or Block filters contain anything like Duels 2015 (although the expansion filter contains several Duels of planeswalker1 vs planeswalker2). Does some other searchable database exist that contains the Duels 2015 cards only?
There is a Duels of the Planeswalkers theme set. To clarify: I am not interested in those cards, but instead the Duels of the Planeswalkers video game and specifically the 2015 version.