Cateran Enforcer is a uncommon Creature — Horror Mercenary card from Mercadian Masques (MMQ), collector number 121. Current market price: $0.20 (foil $5.23), TCGplayer market prices via Scryfall.
Fear (This creature can't be blocked except by artifact creatures and/or black creatures.) {4}, {T}: Search your library for a Mercenary permanent card with mana value 4 or less, put it onto the battlefield, then shuffle.