Cheapest priced copy (Jumpstart 2022): $0.35 at Card Kingdom, near mint, their price list as of .
Swift Kick 
Instant · Common · Khans of Tarkir · #122
Target creature you control gets +1/+0 until end of turn. It fights target creature you don't control.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Jumpstart 2022 | 612 | Common | $0.35 | — |
| Khans of Tarkir | 122 | Common | $0.35 | $0.49 |
| The List | KTK-122 | Common | $0.35 | — |
3 rulings from Wizards of the Coast
- 20 September 2014If just the creature you control is an illegal target when Swift Kick tries to resolve, it won’t get +1/+0 until end of turn. If the creature you control is a legal target but the creature you don’t control isn’t, the creature you control will get +1/+0 until end of turn.
- 20 September 2014If either target is an illegal target when Swift Kick tries to resolve, neither creature will deal or be dealt damage.
- 20 September 2014You can’t cast Swift Kick unless you target both a creature you control and a creature you don’t control.