wotc
No player may take actions between the time you choose a card and the time it's exiled.
No player may take actions between the time you choose a card and the time it's exiled.
If there are no nonland cards in their hand and no cards in their graveyard, then you just lose 1 life.
If you choose a card from their graveyard, it may be a land card.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Robbie Trevino
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You must choose a card to exile if able. If there are no nonland cards in the opponent's hand, you must exile a card from their graveyard, and vice versa.