Is Simic Cluestone legal in Standard, Modern, and Commander?

Simic Cluestone is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper.

Simic Cluestone

Q: What type of card is Simic Cluestone?

Simic Cluestone is an Artifact. Its oracle text reads: "{T}: Add {G} or {U}. {G}{U}, {T}, Sacrifice this artifact: Draw a card. *Simic symbols are among the most intricate and fragile, yet few vandalize them for fear of the strange lifeforms that might be released.*"