Cateran Overlord is a rare Creature — Horror Mercenary card from Mercadian Masques (MMQ), collector number 123. Current market price: $0.74 (foil $13.20), TCGplayer market prices via Scryfall.
Sacrifice a creature: Regenerate this creature. {6}, {T}: Search your library for a Mercenary permanent card with mana value 6 or less, put it onto the battlefield, then shuffle.