Cheapest priced copy (Tempest): $7.49 at Card Kingdom, near mint, their price list as of .
Helm of Possession 
Artifact · Rare · Tempest · #291
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.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $7.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tempest | 291 | Rare | $7.49 | — |