Wizard's Spellbook — Adventures in the Forgotten Realms #370

: 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 rather than paying its mana cost.

20 | Copy each card exiled with this artifact. You may cast any number of the copies without paying their mana costs.