Merry Christmas!

In Seasons Mode, at the end of a battle there is a chance to pick a Present or a Stolen card.

Presents contain a random lower level card marked as Nice.
Stolen Cards are higher level cards but they are marked as Naughty.
Nice and Naughty cards perform a random effect when they are played.
Enemies also play Naughty and Nice Cards.

If you obtain enough Naughty or Nice cards you may even find Santa or the Krampus!