Cheapest priced copy (Dragon's Maze): $0.35 at Card Kingdom, near mint, their price list as of .
Beetleform Mage 
Creature — Human Insect Wizard · 2/2 · Common · Dragon's Maze · #54
{G}{U}: This creature gets +2/+2 and gains flying until end of turn. Activate only once each turn.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dragon's Maze | 54 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 15 April 2013If Beetleform Mage's ability is activated by one player, then another player gains control of it during the same turn, the second player can't activate its ability that turn.
- 15 April 2013Activating Beetleform Mage's ability after it's been blocked by a creature without flying or reach won't cause it to become unblocked.