Grim Hireling is a rare Creature — Tiefling Rogue card from Forgotten Realms Commander (AFC), collector number 294. Current market price: $12.86, TCGplayer market prices via Scryfall.
Whenever one or more creatures you control deal combat damage to a player, create two Treasure tokens. {B}, Sacrifice X Treasures: Target creature gets -X/-X until end of turn. Activate only as a sorcery.