Cheapest priced copy (Duel Decks: Knights vs. Dragons): $0.35 at Card Kingdom, near mint, their price list as of .
Lionheart Maverick 
Creature — Human Knight · 1/1 · Common · Guildpact · #11
Vigilance
{4}{W}: This creature gets +1/+2 until end of turn.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Knights vs. Dragons | 3 | Common | $0.35 | — |
| Guildpact | 11 | Common | $0.35 | $0.49 |