Eragorn, the Hidden Mountain

Eragorn, the Hidden Mountain enters tapped.
{t}: Add {w}, {u}, or {r}
{x}{w}{r},{t}: Creatures you control gain +X/+X
and haste until end of turn.
{2}{b}{r}, Sacrifice this land: Create a 6/6 black
Demon Dragon token with trample and
indestructible.