Gakren's Keep

({t}: Add {u} or {b} to your mana pool.)
As Gakren's Keep enters the battlefield, you
may pay 2 life. If you don't, it enters the
battlefield tapped.

Before the plague the infer-structure in King Nekros's Kingdom was massive. Even-though Nadiya's plague
left in ruins, Gakren's Kingdom became so much
more.