The Necrotic Manuscripts

{t}: Exile target instant or sorcery card from a graveyard. Roll a d20. Activate only as a sorcery.

1–9 | Copy that card. You may cast the copy.

10–19 | Copy that card. You may cast the copy by paying 1 rather than paying its mana cost.

20 | Copy each card exiled with Wizard's Spellbook. You may cast any number of the copies without paying their mana costs.