Harvester of Men

Menace
When this creature enters the battlefield, destroy target creature you don't control.
Whenever Harvester of Men destroys a creature,
it gains +X/+Y where X is that creatures power
and Y is that creature toughness.
At the Beginning of of your End Step,
if Harvester of men has the greatest combined
Power and Toughness of all creatures on the field,
draw 1 card.