Cheapest priced copy (Khans of Tarkir): $0.35 at Card Kingdom, near mint, their price list as of .
Winterflame 
Instant · Uncommon · Khans of Tarkir · #213
Choose one or both —
• Tap target creature.
• Winterflame deals 2 damage to target creature.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Khans of Tarkir | 213 | Uncommon | $0.35 | $0.49 |
3 rulings from Wizards of the Coast
- 20 September 2014Winterflame won’t affect any target that’s illegal as it tries to resolve. If you choose to use both modes and both targets are illegal at that time, Winterflame won’t resolve.
- 20 September 2014If you choose both modes, they can each target the same creature or they can target different creatures.
- 20 September 2014You choose which mode you’re using—or that you’re using both modes—as you’re casting the spell. Once this choice is made, it can’t be changed later while the spell is on the stack.