Helm of Possession 291/350 (Tempest)

You may choose not to untap this artifact during your untap step. {2}, {T}, Sacrifice a creature: Gain control of target creature for as long as you control this artifact and this artifact remains tapped.

NM - $9.50
LP - $7.60
MP - $5.70
HP - $3.80
DMG - $1.90