Cheapest priced copy (Duel Decks: Knights vs. Dragons): $0.35 at Card Kingdom, near mint, their price list as of .
Bogardan Rager 
Creature — Elemental · 3/4 · Common · Duel Decks: Knights vs. Dragons · #57
Flash (You may cast this spell any time you could cast an instant.)
When this creature enters, target creature gets +4/+0 until end of turn.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Knights vs. Dragons | 57 | Common | $0.35 | — |
| Planechase | 49 | Common | $0.35 | — |
| Time Spiral | 148 | Common | $0.35 | $0.49 |