The illustrations were created by artist Vrublevskiy, and at first glance, they appear to be generic renderings of classic fairytales, nursery rhymes, and children's stories, including the Wizard of Oz, Three Little Pigs, and Pied Piper.
One image, however, stands out within the group. Rather than depicting Snow White and the Seven Dwarfs in a nonspecific illustration, the artist instead chose to recreate the actual Disney characters, probably without the company's knowledge.
Two cards placed together measure 5.3" x 3.7" (13.3 x 9.5cm). The correct sum for each pair is printed on the backside.
Images via RealTreasureBox.
Special thanks to William Stillman for the heads-up on this one.