Cheapest priced copy (Rivals of Ixalan): $0.35 at Card Kingdom, near mint, their price list as of .
See Red 
Enchantment — Aura · Uncommon · Rivals of Ixalan · #112
Enchant creature
Enchanted creature gets +2/+1 and has first strike.
At the beginning of your end step, if you didn't attack with a creature this turn, sacrifice this Aura.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Rivals of Ixalan | 112 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 19 January 2018See Red's last ability is satisfied if any creature has attacked, similar to raid abilities. The creature it enchants doesn't have to have attacked.