Soul Scavenger

When another creature dies draw a card and put
your choice of a +1/+1, deathtouch, menace,
flying, or soul counter on Soul Scavenger.
{1}{u/b}{b}{t} put a -1/-1 counter on target creature
When Soul Scavenger dies return upto x
creatures from your graveyard to the top of your
library in any order, where x is equal to the
amount of soul counters on Soul Scavenger.