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Counter target instant or sorcery spell. Search its controller's graveyard, hand, and library for any number of cards with the same name as that spell and exile them. That player shuffles, then draws a card for each card exiled from their hand this way.
Countering a spell normally puts that card into the graveyard, so that card will be there to find and exile.
If the back face of a modal double-faced card is countered, you will not be able to exile any cards, including the one that you countered, because those cards have only their front-face characteristics (including name) in the graveyard, hand, and library.
