Cheapest priced copy (Duel Decks: Elspeth vs. Tezzeret): $0.35 at Card Kingdom, near mint, their price list as of .
Kor Hookmaster 
Creature — Kor Soldier · 2/2 · Common · Zendikar · #20
When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
6 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Elspeth vs. Tezzeret | 12 | Common | $0.35 | — |
| Duel Decks: Speed vs. Cunning | 52 | Common | $0.35 | — |
| Eternal Masters | 18 | Common | $0.35 | $0.49 |
| Modern Masters 2017 | 10 | Common | $0.35 | $0.49 |
| The List | EMA-18 | Common | $0.35 | — |
| Zendikar | 20 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 14 March 2017Kor Hookmaster’s ability can target a creature that’s already tapped. It still won’t untap during its controller’s next untap step.