Cheapest priced copy (Journey into Nyx): $0.35 at Card Kingdom, near mint, their price list as of .
Bladetusk Boar 
Creature — Boar · 3/2 · Common · Journey into Nyx · #90
Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Journey into Nyx | 90 | Common | $0.35 | $0.49 |
| Magic 2013 | 121 | Common | $0.35 | $0.49 |
| Zendikar | 118 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 1 October 2009Intimidate looks at the current colors of a creature that has it. Normally, Bladetusk Boar can't be blocked except by artifact creatures and/or red creatures. If it's turned blue, then it can't be blocked except by artifact creatures and/or blue creatures.
- 1 October 2009If an attacking creature has intimidate, what colors it is matters only as the defending player declares blockers. Once it's blocked, changing its colors won't change that.