Behind the Scenes is a uncommon Enchantment card from Shadows over Innistrad (SOI), collector number 100. Current market price: $0.25 (foil $5.05), TCGplayer market prices via Scryfall.
Creatures you control have skulk. (They can't be blocked by creatures with greater power.) {4}{W}: Creatures you control get +1/+1 until end of turn.