Cheapest priced copy (Coldsnap): $0.35 at Card Kingdom, near mint, their price list as of .
Rimehorn Aurochs 
Snow Creature — Aurochs · 3/3 · Uncommon · Coldsnap · #118
Trample
Whenever this creature attacks, it gets +1/+0 until end of turn for each other attacking Aurochs.
{2}{S}: Target creature blocks target creature this turn if able. ({S} can be paid with one mana from a snow source.)
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.35 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Coldsnap | 118 | Uncommon | $0.35 | $0.99 |
2 rulings from Wizards of the Coast
- 15 July 2006If the first creature targeted by Rimehorn Aurochs can’t block the second targeted creature (for example, because the second creature has flying and the first doesn’t, or because both creatures are controlled by the same player), the ability does nothing and the first creature is free to block whichever creature its controller chooses, or block no creatures at all.
- 15 July 2006Abilities of Aurochs care about other creatures that have creature type Aurochs, which includes (but is not limited to) the Ice Age card namedAurochs.