Dirith-Ungad, Lost to the Sand

{t}: Add one mana of any color. Activate
only if you control Legendary creature.
{1}, {t}: Put an uncover counter on
Dirith-Ungad, Lost to the Sand. When
there are 4 or more uncover counters
on it, search your deck for an artifact
and put it into your hand. Then shuffle
your library. Activate only as a sorcery.