Cheapest priced copy (Beatdown Box Set): $0.35 at Card Kingdom, near mint, their price list as of .
Crashing Boars 
Creature — Boar · 4/4 · Uncommon · The List · #EXO-108
Whenever this creature attacks, defending player chooses an untapped creature they control. That creature blocks this creature this turn if able.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Beatdown Box Set | 52 | Uncommon | $0.35 | — |
| Exodus | 108 | Uncommon | $0.35 | — |
| The List | EXO-108 | Uncommon | $0.35 | — |
2 rulings from Wizards of the Coast
- 4 October 2004If the chosen creature is not still untapped at the time blockers are declared, it does not have to block.
- 4 October 2004The ability is not optional. If there are no untapped creatures to choose, then the ability does nothing.