Cheapest priced copy (Ravnica: Clue Edition): $0.35 at Card Kingdom, near mint, their price list as of .
Yeva's Forcemage 
Creature — Elf Shaman · 2/2 · Common · The List · #ORI-208
When this creature enters, target creature gets +2/+2 until end of turn.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
4 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ravnica: Clue Edition | 181 | Common | $0.35 | — |
| Magic 2013 | 198 | Common | $0.35 | $0.49 |
| Magic Origins | 208 | Common | $0.35 | $0.49 |
| The List | ORI-208 | Common | $0.35 | — |
One ruling from Wizards of the Coast
- 1 July 2012Yeva’s Forcemage’s ability is mandatory, although you can choose Yeva’s Forcemage as the target.