Gakren's Keep

({t}: Add {u}, {b}, or {r} to your mana pool.)
As Gakren's Keep enters the battlefield, you
may pay 3 life. If you don't, it enters the
battlefield tapped.
Before the Shambling, the former king's
infrastructure was massive. Even though Nadiya's
plague left it in ruins, under Gakren's rule the
kingdom became so much more.