Is Plaza of Heroes legal in Standard, Modern, and Commander?

Plaza of Heroes is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Plaza of Heroes?

Plaza of Heroes is a Land. Its oracle text reads: "{T}: Add {C}. {T}: Add one mana of any color. Spend this mana only to cast a legendary spell. {T}: Add one mana of any color among legendary permanents you control. {3}, {T}, Exile this land: Target legendary creature gains hexproof and indestructible until end of turn."