Merfolk Spy is a common Creature — Merfolk Rogue card from Magic 2011 (M11), collector number 66. Current market price: $0.16 (foil $0.30), 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.