Mox Opal
Legendary Artifact
Metalcraft — 
: Add one mana of any color. Activate only if you control three or more artifacts.
The suns of Mirrodin have shone upon perfection only once.
Volkan Baǵa
Rulings
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.”
(wotc • 2020-08-07)
Rulings
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.”
(wotc • 2020-08-07)