Your Mana Rock 
Artifact
Your Mana Rock enters the battlefield tapped.
During deckbuilding, write two different colors on Your Mana Rock.
: Add one mana of a color written on Your Mana Rock.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageNOT LEGALcommanderNOT LEGAL