Valley of the Dark Lords

As Valley of the Dark Lords enters the battlefield,
you may sacrifice a creature. If you don't, it
enters the battlefield tapped.
{t}: {b} or {r}
{t}, {b}{b}{r}{r}, Sacrifice Valley of the Dark Lords: Create four 1/1 Sith Warrior creature tokens with
haste and decayed.
Only in the dark lords' tombs did Bane believe he
could find his full potential as a Sith.