Mox Opal

Legendary Artifact

Legal Salt 1.18RampEDHREC #238

Metalcraft — {T} : Add one mana of any color. Activate only if you control three or more artifacts.

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2020-08-07
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.”