Cheapest priced copy (Dragon's Maze): $0.35 at Card Kingdom, near mint, their price list as of .
Feral Animist 
Creature — Goblin Shaman · 2/1 · Uncommon · Dragon's Maze · #70
{3}: This creature gets +X/+0 until end of turn, where X is its power.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dragon's Maze | 70 | Uncommon | $0.35 | $0.49 |
| Guildpact | 112 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 15 April 2013You don't choose the value of X. The bonus Feral Animist gets is based on its power when the ability resolves. For example, if you activate the ability twice, the first ability will give it +2/+0 and the second one will give it +4/+0.
- 14 July 2017If this creature's power is negative as its ability resolves, X is considered to be 0.