Dragonsreach, Hilltop Exile

This land enters the battlefield tapped unless
you control Whiterun Hold. You may opt to keep Dragonsreach, Hilltop Exile tapped on your untap step.

{t}: add {w}

{2}{t}: Tap two creatures you control, then tap target legendary creature you don't control. They don't untap for as long as Dragonsreach, Hilltop Exile is tapped.