Jar of Flies

Jar of Flies is an activated item added in Afterbirth.

Effects

 * Killing an enemy adds a fly to the jar, up to a maximum of 20.
 * Upon use, releases Blue Flies equal to the number of flies in the jar.

Seeds
KTHW HTAY (First floor, in the shop)

Trivia

 * The item's pickup quote references the tagline of the Pokemon games.