When playing a shockland from your library, it doesn't actually leave the library until after you've made the decision about whether to pay two life or not. That means you don't get to see the next card down before making that choice!
…and knowing is half the battlefield
When playing a shockland from your library, it doesn't actually leave the library until after you've made the decision about whether to pay two life or not. That means you don't get to see the next card down before making that choice!