Evtar the all consuming

deathtouch, defender
ooze creatures you control get +1 +1 for each sludge counter on them
Whenever a creature card would leave or enter a graveyard, you may exile it. if you do, each opponent loses 3 life, you gain 3 life, and you put a sludge counter on each ooze you control.
as long as Evtar has 3 or more sludge counters, it loses defender
{b/g}{b/g}, exile a creature card from a graveyard: create a 2/1 black and green ooze token with deathtouch