Yawgmoth Demon

{4}{B}{B} · Creature — Phyrexian Demon

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 this creature and it deals 2 damage to you.

Motor: se resuelve a mano

Rulings (1)

The sacrificing of an artifact is not mandatory. You can choose not to sacrifice an artifact but will pay the consequences.
Wizards of the Coast · 2004-10-04