Cheapest priced copy (Torment): $3.49 at Card Kingdom, near mint, their price list as of .
Hypnox 
Creature — Nightmare Horror · 8/8 · Rare · Torment · #64
Flying
When this creature enters, if you cast it from your hand, exile all cards from target opponent's hand.
When this creature leaves the battlefield, return the exiled cards to their owner's hand.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $3.49 to $27.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Torment | 64 | Rare | $3.49 | $27.99 |
One ruling from Wizards of the Coast
- 20 September 2013If a creature (such as Clone) enters the battlefield as a copy of this creature, the copy’s “enters-the-battlefield” ability will still trigger as long as you cast that creature spell from your hand.