Corpseshadow, Blight Harvester

{x}{b}{g}: Until the end of this turn, scarecrow creatures you control gain +X/+X and gain wither and persist.
{1}{w}{b}, {t}, Return a creature card with a
soul counter to the bottom of its owner's
library. You create a number of 3/2
scarecrow creature tokens equal to the
returned creature's mana value.