Cheapest priced copy (Foundations Jumpstart): $0.35 at Card Kingdom, near mint, their price list as of .
Advocate of the Beast 
Creature — Elf Shaman · 2/3 · Common · Foundations Jumpstart · #622
At the beginning of your end step, put a +1/+1 counter on target Beast creature you control.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Foundations Jumpstart | 622 | Common | $0.35 | — |
| Magic 2014 | 164 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 1 July 2013If you don't control any Beast creatures as your end step begins, the ability will be removed from the stack and will have no effect.