Tol-in-Gaurhoth, Isle of Dread

Threshold- Tol-in-Gaurhoth, Isle of Dread enters
the battlefield tapped unless you have at least
seven cards in your graveyard.
{t}: add {u}, {b}, or {g} to your mana pool
{1}{u}{b}{g}{t}: Search your library for a card
named Gorthaur, the Cruel and put it into play.