Smokestack 
Artifact
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.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL