Are you tired of resetting runs because you couldn't get the Key Pieces for Mega Satan?
Now you can find Dad's Key to open the door in the starting room of Chest and Dark Room

I only own Afterbirth so I don't know if the mod works for other DLCs.

HOW TO INSTALL:
Extract the .zip archive content into "Steam/steamapps/common/The Binding of Isaac Rebirth/resources"