Battlefield Ooze

When Battlefield Ooze enters the battlefield, put
X +1/+1 counters on it.
Whenever Battlefield Ooze is dealt damage,
prevent that damage and remove a +1/+1 counter
from it. Draw a card and lose 1 life.
{1}{g},{t}: Exile a card from an opponent's
graveyard. If it was a creature card, put a +1/+1 counter onto Battlefield Ooze and gain 1 life.