Eladamri, Korvecdal
You may look at the top card of your library any time. You may cast creature spells from the top of your library. {G}, {T}, Tap two untapped creatures you control: Reveal a card from your hand or the top card of your library. If you reveal a creature card this way, put it onto the battlefield. Activate only during your turn.
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Official rulings (4) · Scryfall
You must pay all costs and follow all timing rules for spells cast from the top of your library this way.
Because you never "cast" a land card, Eladamri, Korvecdal doesn't allow you to play a land creature (such as Dryad Arbor) from the top of your library.
If the top card of your library changes while you're casting a spell, playing a land, or activating an ability, you can't look at the new top card until you finish doing so. This means that if you cast a spell from the top of your library, you can't look at the next one until you're done paying for that spell.
You can look at the top card of your library whenever you want (with one restriction; see below), even if you don't have priority. This action doesn't use the stack. Knowing what that card is becomes part of the information you have access to, just like you can look at the cards in your hand.