Merfolk Spy

Oracle Text

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Whenever Merfolk Spy deals combat damage to a player, that player reveals a card at random from their hand.

Card Rulings

8/15/2010 Islandwalk cares about lands with the land type Island, not necessarily lands named Island.
8/15/2010 The second ability triggers just once each time Merfolk Spy deals combat damage to a player, regardless of how much damage it deals.
8/15/2010 After the second ability resolves, the revealed card stops being revealed in its owner’s hand.
8/15/2010 The 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.