Chromon River

{t} : add {w}, {u} or {b} to your mana pool.
{1}{p/w}{p/u}{p/b}{t} Monstrosity (Chromon River
gains Monstrous)
So long as Chromon River is Monstrous, Horror type creatures gain a +1/+1 counter whenever a Insect is placed into a graveyard.