Esurient Fleshrancher

Harvest: (Whenever a creature leaves the battlefield
as result of fighting this creature, or whenever another
creature you control is sent to the graveyard, add one
energy counter on this creature.)
Whenever Esurient Fleshrancher enters the battlefield, create two 2/2 black mutant creature tokens.
{e}{e}, {t}: Mutant creatures you control get +1/+0,
and menace until end of turn.