Walker at the Edge of Dreams

During the endstep, you may pay {x}. If you do, return X illusion creatures you sacrificed this turn to the battlefield, but they are horrors in addition to their other types
and are black in addition to their other colors.
{p/u}{p/b}:Horrors you control get +2/+0 until
end of turn and Illusions you control get
+0/+2 until end of turn.