Eclipsed Boggart is a uncommon Creature — Goblin Scout card from Lorwyn Eclipsed (ECL), collector number 335. Current market price: $0.25 (foil $0.30), TCGplayer market prices via Scryfall.
When this creature enters, look at the top four cards of your library. You may reveal a Goblin, Swamp, or Mountain card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.