Cheapest priced copy (Magic 2011): $0.35 at Card Kingdom, near mint, their price list as of .
Merfolk Spy 
Creature — Merfolk Rogue · 1/1 · Common · Magic 2014 · #62
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Whenever this creature deals combat damage to a player, that player reveals a card at random from their hand.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Magic 2011 | 66 | Common | $0.35 | $0.49 |
| Magic 2014 | 62 | Common | $0.35 | $0.49 |
4 rulings from Wizards of the Coast
- 15 August 2010Islandwalk cares about lands with the land type Island, not necessarily lands named Island.
- 15 August 2010The next time Merfolk Spy deals combat damage to the same player, the card that’s revealed at random may be the same card or may be a different card.
- 15 August 2010After the second ability resolves, the revealed card stops being revealed in its owner’s hand.
- 15 August 2010The second ability triggers just once each time Merfolk Spy deals combat damage to a player, regardless of how much damage it deals.