Gluttony

Trample, Menace
{g}{g}{t}: you may have gluttony deal damage equal
to its power to target creature. If that creature
dies, put a +1/+1 counter on gluttony, then gain
life equal to the number of counters on it.
{g}{ut}, sacrifice a creature: put a +1/+1 counter
on Gluttony, then gain life equal to the number
of +1/+1 counters on gluttony. Gluttony gains
indestructible until the end of the turn.