Corrupt Customs

Exile the top four cards of your library face down, then search your library for a card and exile it face down. Look at the exiled cards and separate them into two face-down piles, then turn each pile face up. An opponent chooses one of those piles. Put that pile into your hand and the other into your graveyard. Then shuffle.
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It is hard look the other way when there is corruption everywhere you look.