Grim Hireling is a rare Creature — Tiefling Rogue card from Secret Lair Drop (SLD), collector number 2493. Current market price: $14.80 (foil $15.75), 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.