Card Launcher
Here's some special specifics to this gun

Projectiles appear as one of the four images in the zip folder randomly. The black hand-like object on the card in the firing animation would be the Gungeoneer's hand in-game, as if he is shooting the cards off quickly like a magician. This weapon would appear in brown chests.

The weapon would have 52 ammo and deal damage equal to two and a half shots from Marine's starting weapon.

EDIT: Added new empty sprite featuring a Bullet Kin card.