Rakdos Guildmage is a uncommon Creature — Zombie Shaman card from Dissension (DIS), collector number 145. Current market price: $0.11 (foil $0.83), TCGplayer market prices via Scryfall.
({B/R} can be paid with either {B} or {R}.) {3}{B}, Discard a card: Target creature gets -2/-2 until end of turn. {3}{R}: Create a 2/1 red Goblin creature token with haste. Exile it at the beginning of the next end step.