Barad-dûr, the Dark Tower

Barad-dur, the Dark Tower enters the battlefield
tapped unless you control a legendary creature.
{t}: Add {b}.
{x}{x}{b}, {t}: Amass Orcs X.
Activate only if a creature died this turn.
"Barad-dur, the Dark Tower, which suffered
no rival, and laughed at flattery, biding its time,
secure in its pride and its immeasurable strength."