Cheapest priced copy (Eternal Masters): $0.35 at Card Kingdom, near mint, their price list as of .
Keldon Champion 
Creature — Human Barbarian · 3/2 · Uncommon · Urza's Destiny · #90
Haste
Echo {2}{R}{R} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
When this creature enters, it deals 3 damage to target player or planeswalker.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
5 printings · $0.35 to $4.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Eternal Masters | 135 | Uncommon | $0.35 | $0.49 |
| Planechase | 58 | Uncommon | $0.35 | — |
| Premium Deck Series: Fire and Lightning | 14 | Uncommon | — | $0.35 |
| The List | UDS-90 | Uncommon | $0.35 | — |
| Urza's Destiny | 90 | Uncommon | $0.35 | $4.49 |