Is Urza, Lord Protector legal in Standard, Modern, and Commander?

Urza, Lord Protector is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Urza, Lord Protector?

Urza, Lord Protector is a Legendary Creature — Human Artificer. Its oracle text reads: "Artifact, instant, and sorcery spells you cast cost {1} less to cast. {7}: If you both own and control Urza, Lord Protector and an artifact named The Mightstone and Weakstone, exile them, then meld them into Urza, Planeswalker. Activate only as a sorcery."

Urza, Lord Protector

Legendary Creature — Human Artificer

Artifact, instant, and sorcery spells you cast cost less to cast.

: If you both own and control Urza, Lord Protector and an artifact named The Mightstone and Weakstone, exile them, then meld them into Urza, Planeswalker. Activate only as a sorcery.