This cards are part of the Waifu Christmas Advent Calendar. You can purchase them all together at a very convenient price with the calendar, or singularly :)
 Waifu Foil Card

Custom NSFW proxy printed on high quality foil paper. The card may show some little imperfection since it's hand-made. Not for use in official sanctioned play/tournaments, this card is a proxy and is not meant to be confused with any existing brand or future official products.