Cheapest priced copy (Portal Second Age): $0.35 at Card Kingdom, near mint, their price list as of .
Wild Ox 
Creature — Ox · 3/3 · Uncommon · Starter 1999 · #151
Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Portal Second Age | 150 | Uncommon | $0.35 | — |
| Starter 1999 | 151 | Uncommon | $0.35 | — |