Krell

Krell enters the battlefield with a +1/+1 counter
on it for each creature card in your graveyard.
{2}{b}{b}, Put the top four cards of your library
into your graveyard: Return Krell from your
graveyard to the battlefield.
{3}{b}{b},{t} Sacrifice X other creatures: Return X
target creature cards from your graveyard to the
battlefield.