Cheapest priced copy (Khans of Tarkir): $0.35 at Card Kingdom, near mint, their price list as of .
Heir of the Wilds 
Creature — Human Warrior · 2/2 · Uncommon · Khans of Tarkir Promos · #134
Deathtouch
Ferocious — Whenever this creature attacks, if you control a creature with power 4 or greater, this creature gets +1/+1 until end of turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.69 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Khans of Tarkir | 134 | Uncommon | $0.35 | $0.49 |
| Khans of Tarkir Promos | 134 | Uncommon | $0.69 | — |
One ruling from Wizards of the Coast
- 20 September 2014Heir of the Wilds has a triggered ferocious ability with an intervening “if” clause. That ability will check if you control a creature with power 4 or greater whenever Heir of the Wilds attacks. If you don’t at that time, the ability won’t trigger at all. If it triggers, the ability will also check if you control a creature with power 4 or greater as it resolves. If you don’t at that time, the ability won’t do anything. Note that the creature with power 4 or greater you control as the ability triggers doesn’t necessarily have to be the same one you control as the ability resolves.