Plaza of Heroes is a mythic Land card from Edge of Eternities: Stellar Sights (EOS), collector number 78. Current market price: $44.44 (foil $84.97), TCGplayer market prices via Scryfall.
{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.