Bilglur

Bilglur’s Keep enters the battlefield tapped unless you control a Legendary creature. {T}: Add one mana of any color, use this mana only to cast legendary spells. {3}{T}, Sacrifice Bilglur: Look at the top five cards of your library. You may reveal a Legendary creature card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.