Leo, Primordial Hunger

Vigilance, Reach, Trample.
{g}{t}: Sacrifice a land. Add {g}{b}. This mana is
kept until spent. Put a hunger counter on Leo.
{1}{b}: Sacrifice a creature. Target creature gets
a -1/-1 counter. Put a hunger counter on Leo.
At any time, you may remove a hunger counter
from Leo. If you do, target creature gets a +1/+1
counter and gains deathtouch until the
end of this turn.