Gorthur Gvaed

Sandsteppe Citadel enters the battlefield tapped.
{t}:Add{w},{b}, or {g} to you mana pool.
(Gorthur Gvaed, also spelled as or Gorthwe
Gvaed, and at times called the Viper Keep or
Blood Gate Keep, was a seat of the
witcher School of the Viper.)