Hallows' Dominion

Cards that are Skeletons, Zombies, Scarecrows, Spirits, or have “Pumpkin” in their name are now Halloween in addition to their other types
Halloween Creatures you control get +2/+2
and gain menace.
Harvest of Fear — At the beginning of your upkeep, create a 1/1 black Skeleton creature token with deathtouch for each Halloween creature you control.