Dark Hordes Rampage

When Dark Hordes Rampage enters the battlefield, search your graveyard for three
zombie creatures and put them onto the
battlefield taped. If an opponent controls a war enchantment you may also search your graveyard
for a demon creature and put it on the battlefield.
{t}: add {b}{b} to your mana pool.
"... and there was one big one, looming over the
festering corpses, laughing..."
-A madman's account of The Breach