Dissertation

{t}: Exile target instant or sorcery card from a graveyard. Roll a d20. Acitvate only as a sorcery.
1 - 9 | Your dissertation is missing details. Copy
and correct that card. You may cast that version.
10 - 19 | Your diss lack in grammar. Correct and
copy that card. You may cast the copy by paying {w} rather than paying its mana cost.
20 | Copy each card exiled with you Dissertation.
You may cast and distribute any number of the
copies without paying their mana costs.