Cheapest priced copy (Commander Anthology): $0.49 at Card Kingdom, near mint, their price list as of .
Rubinia Soulsinger 
Legendary Creature — Faerie · 2/3 · Rare · Commander 2013 · #207
You may choose not to untap Rubinia Soulsinger during your untap step.
{T}: Gain control of target creature for as long as you control Rubinia Soulsinger and Rubinia Soulsinger remains tapped.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
6 printings · $0.49 to $20.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Chronicles Foreign Black Border | 83 | Rare | — | — |
| Commander 2013 | 207 | Rare | $0.59 | — |
| Chronicles | 83 | Rare | $0.59 | — |
| Commander Anthology | 191 | Rare | $0.49 | — |
| Legends | 256 | Rare | $20.99 | — |
| Commander 2013 Oversized | 207 | Rare | — | $0.49 |
3 rulings from Wizards of the Coast
- 1 October 2009If Rubinia Soulsinger stops being tapped before its ability resolves — even if it becomes tapped again right away — you won't gain control of the targeted creature at all. The same is true if you lose control of Rubinia Soulsinger before the ability resolves.
- 1 October 2009Once the ability resolves, it doesn't care whether the targeted permanent remains a legal target for the ability, only that it's on the battlefield. The effect will continue to apply to it even if it gains shroud, stops being a creature, or would no longer be a legal target for any other reason.
- 1 October 2009If Rubinia Soulsinger leaves the battlefield, you no longer control it, so the duration of its control-change effect ends.