Cult Guildmage is a uncommon Creature — Human Shaman card from Ravnica Allegiance (RNA), collector number 164. Current market price: $0.07 (foil $0.43), TCGplayer market prices via Scryfall.
{3}{B}, {T}: Target player discards a card. Activate only as a sorcery. {R}, {T}: This creature deals 1 damage to target opponent or planeswalker.