Diath's Lost Dagger

Diath's Lost Dagger
Weapon (dagger), common
This weapon is considered a mundane dagger when used as a melee weapon. If the dagger is thrown as a ranged weapon attack, it is considered magical for the attack. Additionally, you have a +1 bonus to the attack and damage rolls made with this dagger as part of a ranged attack. After a ranged weapon attack is made with this dagger, it is lost. It cannot be found again as it leaves existence to an unknown extradimensional space to be deposited at a random location at a later time (DM makes the decision as to when and where this dagger will turn up, if at all).