This item is found in the Elona+ mod of Elona. It is a container-type item that gives 5 random cards when opened, including cards of unique NPCs. The cards given by the packs don't have the NPC pictures on them, but they show up when added to a deck.

Child Wel in Larna sells card packs for 500 Music Tickets each.

The sprite for the card pack is located at 549 (Row 16, Column 21) by the character sprite numbering system.