text: As The Maelstrom's first ability resolves, you choose whether or not to reveal the top card of your library. If you reveal it and it's a permanent card, you have two choices: Put it onto the battlefield, or put it on the bottom of your library. It can't remain on top of your library. On the other hand, if you reveal it and it's an instant or sorcery card, it must be put on the bottom of your library. There is no way you can leave a card revealed this way on top of your library.