Cheapest priced copy (Marvel Super Heroes Commander): $0.35 at Card Kingdom, near mint, their price list as of .
Strategic Intervention 
Enchantment · Uncommon · Marvel Super Heroes Commander · #609
Whenever a creature you control attacks alone, it gets +1/+1 until end of turn. Tap up to one target creature defending player controls.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Marvel Super Heroes Commander | 609 | Uncommon | $0.35 | $0.49 |