Lantern of Revealing is a common Artifact card from Alchemy Horizons: Baldur's Gate (HBG), collector number 259.
{T}: Add one mana of any color. {4}, {T}: Look at the top card of your library. If it's a land card, you may put it onto the battlefield tapped. If you don't put the card onto the battlefield, you may put it on the bottom of your library.