Inspired Boneshaper

At the beginning of each end step, if you've cast a
black spell and a red spell this turn (they can be the
same spell), create a 2/1 black Skeleton creature
token with "this creature can't block", then create a
Monster Role token attached to a creature you
control. (If you control another Role on it, put that
one into the graveyard. Enchanted creature gets
+1/+1 and has trample.)

"Go where the people are... Smashing idea."
— Dasakal, necromancer