Elaborate Firecannon is a uncommon Artifact card from Ixalan (XLN), collector number 237. Current market price: $0.06 (foil $0.60), TCGplayer market prices via Scryfall.
This artifact doesn't untap during your untap step. {4}, {T}: This artifact deals 2 damage to any target. At the beginning of your upkeep, you may discard a card. If you do, untap this artifact.