Cheapest priced copy (The List): $0.99 at Card Kingdom, near mint, their price list as of .
Reckless Rage 
Instant · Uncommon · Rivals of Ixalan · #110
Reckless Rage deals 4 damage to target creature you don't control and 2 damage to target creature you control.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.99 to $9.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The List | RIX-110 | Uncommon | $0.99 | — |
| Rivals of Ixalan | 110 | Uncommon | $0.99 | $9.99 |
2 rulings from Wizards of the Coast
- 19 January 2018You can’t cast Reckless Rage unless you choose both a creature you control and a creature you don’t control as targets.
- 19 January 2018If either target is an illegal target as Reckless Rage resolves, the other will still be dealt damage.