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When Mangara's Tome enters the battlefield, search your library for five cards, exile them in a face-down pile, and shuffle that pile. Then shuffle your library.
{2}: The next time you would draw a card this turn, instead put the top card of the exiled pile into its owner's hand.
If there are no cards left, you can still use the ability to turn a draw into a “do nothing”.
The ability is a replacement effect that replaces a draw.
