Engulfing Ooze

Indestructible, trample, menace
When Engulfing Ooze blocks a creature
or becomes blocked by a creature, destroy
that creature, then put a +1/+1 counter onto
Engulfing Ooze.
{c}, Sacrifice a creature: Put X +1/+1 counters
onto Engulfing Ooze, where X is equal to the
number of +1/+1 counters on it.