Mox Opal
Legendary Artifact
Metalcraft — 
: Add one mana of any color. Activate only if you control three or more artifacts.
Illustrated by Volkan Baǵa
Formats
Not Legalstandard
Bannedhistoric
Legaltimeless
Not Legalpioneer
Legalmodern
Legallegacy
Not Legalpauper
Legalvintage
Not Legalpenny
Legalcommander
Legaloathbreaker
Legalbrawl
Not Legalalchemy
This printing
Rulings (1)
If you control Mox Opal and one other artifact, then have a second Mox Opal enter the battlefield as your third artifact, you can't activate either one's mana ability before putting one into your graveyard due to the “legend rule.”
