Zayloth, Demon King

Every time you play a {b} spell, put 1 Demon Spawn token onto the battlefield.
{1}{b}{t}: Sacrifice {x} Demon Spawn. Zayloth, Demon King gets +{x}/+{x} equal to the number of Demon Spawn tokens sacrificed. All players draw {x} cards.
He does not care about anyone but him. It makes him more ruthless than any other.