Vriska, Dimir Renegade

When Vriska, Dimir Renegade enters the battlefield,
target player reveals the top 8 cards of their library;
exile any number of them.
{t}{8}; Cast target spell with converted mana cost
8 or less that was exiled by Vriska, Dimir Renegade.
{u}{u}{u}{b}{b}{b}{r}{r}, Exile this card from your
graveyard; return it to the battlefield transformed.