Cheapest priced copy (Fate Reforged): $0.49 at Card Kingdom, near mint, their price list as of .
Ojutai, Soul of Winter 
Legendary Creature — Dragon · 5/6 · Rare · Fate Reforged · #156
Flying, vigilance
Whenever a Dragon you control attacks, tap target nonland permanent an opponent controls. That permanent doesn't untap during its controller's next untap step.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.49 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2017 | 187 | Rare | $0.69 | — |
| Fate Reforged | 156 | Rare | $0.49 | $3.99 |
| Fate Reforged Promos | 156s | Rare | — | $3.99 |
3 rulings from Wizards of the Coast
- 24 November 2014The ability tracks the permanent, but not its controller. If the permanent changes controllers before its first controller’s next untap step, then it won’t untap during its new controller’s next untap step.
- 24 November 2014The triggered ability can target a nonland permanent that’s already tapped. That permanent won’t untap during its controller’s next untap step.
- 24 November 2014The ability only applies during the controller’s next untap step, even if the permanent has been the target of Ojutai’s triggered ability more than once. The permanent won’t stay tapped through multiple untap steps.