Cheapest priced copy (Worldwake): $0.35 at Card Kingdom, near mint, their price list as of .
Grotag Thrasher 
Creature — Lizard · 3/3 · Common · Worldwake · #83
Whenever this creature attacks, target creature can't block this turn.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Worldwake | 83 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 1 March 2010The targeted creature is prohibited from blocking any creature this turn, not just Grotag Thrasher.
- 1 March 2010Grotag Thrasher’s ability can target any creature, not just one the defending player controls. For example, if you want that player’s creatures to be able to block this turn, you can target Grotag Thrasher with its own ability.