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

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

Azorius Cluestone

Q: What type of card is Azorius Cluestone?

Azorius Cluestone is an Artifact. Its oracle text reads: "{T}: Add {W} or {U}. {W}{U}, {T}, Sacrifice this artifact: Draw a card. *Its three sides represent the Sova, judges and arbitrators; the Jelenn, scribes and elocutors; and the Lyev, lawmages and enforcers.*"