Carnivorous Reaper

{b/g}{b/g}{b/g}{t}: Carnivorous Reaper fights target
creature. If target creature dies, this creature
gets +1/+1 counters equal to half the converted
mana cost of the target creature, rounded up.
Carnivorous Reaper cannot attack or block.
When Carnivorous Reaper leaves the battlefield,
if you control another card named Carnivorous
Reaper, you may choose to move all the
+1/+1 counters on this creature to it.