Cheapest priced copy (Khans of Tarkir): $0.99 at Card Kingdom, near mint, their price list as of .
Icy Blast 
Instant · Rare · Khans of Tarkir · #42
Tap X target creatures.
Ferocious — If you control a creature with power 4 or greater, those creatures don't untap during their controllers' next untap steps.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.99 to $2.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Khans of Tarkir | 42 | Rare | $0.99 | $1.49 |
| Khans of Tarkir Promos | 42s | Rare | — | $2.79 |
5 rulings from Wizards of the Coast
- 20 September 2014You check if you control a creature with power 4 or greater as Icy Blast resolves. It doesn’t matter if you control such a creature during any of the relevant untap steps.
- 20 September 2014Icy Blast tracks the creature, but not its controller. If the creature changes controllers before its first controller’s next untap step has come around, then it won’t untap during its new controller’s next untap step.
- 20 September 2014Ferocious abilities of instants and sorceries that don’t use the word “instead” will provide an additional effect if you control a creature with power 4 or greater as they resolve.
- 20 September 2014Some ferocious abilities that appear on instants and sorceries use the word “instead.” These spells have an upgraded effect if you control a creature with power 4 or greater as they resolve. For these, you only get the upgraded effect, not both effects.
- 20 September 2014Icy Blast can target a creature that’s already tapped. It still won’t untap during its controller’s next untap step.