Ains Ooal Gown, God of Death

Whenever a creature dies, put a +1/+1 counter on another target creature you control.
{x}{b}, Discard a card: Put {x} 1/1 black Skeleton creature tokens onto the battlefield.
{b}{b}{b}{b}, {t}, Sacrifice a creature: Put a 7/7 black Death Knight creature token with vigilance, trample, and first strike onto the battlefield.