When Blighting Ooze enters the battlefield, put a -1/-1 counter on each of up to X target creatures. As long as Blighting Ooze is on the battlefield, it has all activated abilities of each creature with a -1/-1 counter on it.
Equipped creature gets +1/+1 for each charge counter on Bloodstained Knife. {2}, Sacrifice a creature: Put a charge counter on Bloodstained Knife. Equip {2}