Wizard's Spellbook - Promo Pack (PAFR) from Adventures in the Forgotten Realms, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Iris Compiet
• Card Text:
  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.