Creature — Demon 6/6, 4BB (6)
Rare (U1)
Flying (This creature can't be blocked except by creatures with flying or reach.)
First strike (This creature deals combat damage before creatures without first strike.)
At the beginning of your upkeep, you may sacrifice an artifact. If you don't, tap Yawgmoth Demon and it deals 2 damage to you.
Illus. Sandra Everingham

10/4/2004: The sacrificing of an artifact is not mandatory. You can choose not to sacrifice an artifact but will pay the consequences.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern