Cheapest priced copy (Masters 25): $1.99 at Card Kingdom, near mint, their price list as of .
Mesmeric Fiend 
Creature — Nightmare Horror · 1/1 · Common · Torment · #69
When this creature enters, target opponent reveals their hand and you choose a nonland card from it. Exile that card.
When this creature leaves the battlefield, return the exiled card to its owner's hand.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
4 printings · $1.99 to $34.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Masters 25 | 97 | Uncommon | $1.99 | $6.99Out of stock |
| Duel Decks: Sorin vs. Tibalt | 7 | Common | $2.29 | — |
| The List | TOR-69 | Common | $2.49 | — |
| Torment | 69 | Common | $2.29 | $34.99 |
One ruling from Wizards of the Coast
- 16 March 2018If Mesmeric Fiend leaves the battlefield before its first ability has resolved, its second ability will trigger and do nothing. Then its first ability will resolve and exile a nonland card from the target opponent's hand indefinitely.