Courier's Briefcase 
Artifact — Treasure
When this artifact enters, create a 1/1 green and white Citizen creature token.
, Sacrifice this artifact: Add one mana of any color.
, , Sacrifice this artifact: Draw three cards.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL