Optimistic Scavenger is a uncommon Creature — Human Scout card from Duskmourn: House of Horror (DSK), collector number 21. Current market price: $0.26 (foil $0.36), TCGplayer market prices via Scryfall.
Eerie — Whenever an enchantment you control enters and whenever you fully unlock a Room, put a +1/+1 counter on target creature.