Merfolk Spy is a common Creature — Merfolk Rogue card from Magic 2014 (M14), collector number 62. Current market price: $0.32 (foil $0.39), TCGplayer market prices via Scryfall.
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.