Magmakin Artillerist is a common Creature — Elemental Pirate card from Aetherdrift (DFT), collector number 137. Current market price: $0.30 (foil $1.56), TCGplayer market prices via Scryfall.
Whenever you discard one or more cards, this creature deals that much damage to each opponent. Cycling {1}{R} ({1}{R}, Discard this card: Draw a card.) When you cycle this card, it deals 1 damage to each opponent.