Is Pelargir Survivor legal in Standard, Modern, and Commander?

Pelargir Survivor is legal in: Modern, Legacy, Vintage, Commander, Pauper, Historic.

Pelargir Survivor

Q: What type of card is Pelargir Survivor?

Pelargir Survivor is a Creature — Human Peasant. Its oracle text reads: "{T}: Add one mana of any color. Spend this mana only to cast an instant or sorcery spell. {5}{U}, {T}: Target player mills three cards. (They put the top three cards of their library into their graveyard.)"