R'lyeh, The Sunken City

({t}: Add {u} or {b}.)
As R'lyeh, The Sunken City enters the
battlefield, you may pay 2 life.
If you don't, it enters the battlefield tapped.
"In his house at R'lyeh dead Cthulhu waits dreaming."
-H.P. Lovecraft, The Call of Cthulhu