Karkerik, Rat Legion Overlord

Whenever another nontoken creature you
control dies, you may exile it. If you do, create
three 1/1 black Rat creature tokens.
{5}{b}, Sacrifice Karkerik, Rat Legion Overlord:
Draw a card and lose 1 life for each exiled
creature you own.
_________________________________________
"An undying hunger. A merciless legion. You will
fear the horde."