Cheapest priced copy (Lorwyn): $0.35 at Card Kingdom, near mint, their price list as of .
Oaken Brawler 
Creature — Treefolk Warrior · 2/4 · Common · Lorwyn · #33
When this creature enters, clash with an opponent. If you win, put a +1/+1 counter on this creature. (Each clashing player reveals the top card of their library, then puts that card on their choice of the top or bottom. A player wins if their card had a greater mana value.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer