Matas, Monster tamer

When Matas enters the battlefield create a 4/4
Black and red chimera creature token with flying
and "{3}{g}{g} Monstrous 4" And "when this
creature becomes monstrous other creatures
you control with monstrous gain '{0} monstrous 4'
until end of turn"
Creatures you control with monstrous cost {2} less to make monstrous