What are the abilities of Wizard's Spellbook?
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{T}: Exile target instant or sorcery card from a graveyard. Roll a d20. Activate only as a sorcery.\n1—9 | Copy that card. You may cast the copy.\n10—19 | Copy that card. You may cast the copy by paying {1} rather than paying its mana cost.\n20 | Copy each card exiled with Wizard's Spellbook. You may cast any number of the copies without paying their mana costs.
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