Scrabbling Skullcrab is a uncommon Creature — Crab Skeleton card from Duskmourn: House of Horror (DSK), collector number 71. Current market price: $0.25 (foil $0.30), TCGplayer market prices via Scryfall.
Eerie — Whenever an enchantment you control enters and whenever you fully unlock a Room, target player mills two cards. (They put the top two cards of their library into their graveyard.)