The Demon Forge

Hellborn Summoning Pit enters the battlefield
tapped, unless you pay {p/b} or {p/r}.
{t}: Add {b} or {r} to your mana pool.
{b}{r}: Create a 2/2 black Demon Knight
token with vigilance or a 2/3 red Demon
Berserker token with menace.
"My will, indominable. My steel, unbreakable. My armies, never ending."