Is Charmed Pendant legal in Standard, Modern, and Commander?

Charmed Pendant is legal in: Legacy, Vintage, Commander.

Charmed Pendant

Q: What type of card is Charmed Pendant?

Charmed Pendant is an Artifact. Its oracle text reads: "{T}, Mill a card: For each colored mana symbol in the milled card's mana cost, add one mana of that color. Activate only as an instant. (For example, if the card's mana cost is {3}{U}{U}{B}, you add {U}{U}{B}.)"

Artifact

, Mill a card: For each colored mana symbol in the milled card's mana cost, add one mana of that color. Activate only as an instant. (For example, if the card's mana cost is , you add .)