Smokestack is a rare Artifact card from Secret Lair Countdown (SLC), collector number 1998. Current market price: $4.95 (foil $4.86), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, you may put a soot counter on this artifact. At the beginning of each player's upkeep, that player sacrifices a permanent of their choice for each soot counter on this artifact.