R'lyeh, Sunken City

R'lyeh, Sunken City enters the battlefield tapped.
{t}Add {u} or {b} to your mana pool. R'lyeh, Sunken City deals 1 damage to you if you don't control a God.
{t}Add {u}{b} to your mana pool. Spend this mana only to cast legendary spells.
{u}{b},{t}: Put target creature card from your graveyard on top of your library.