Viconia, Disciple of Arcana
Legendary Creature — Elf Cleric, {1}{U}{B}
Oracle Text
When this creature specializes, choose up to one target creature card and up to one target instant or sorcery card from among cards exiled with this creature. Conjure a duplicate of each of those cards into your hand. The duplicates perpetually gain "You may spend mana as though it were mana of any color to cast this spell."
{1}: Exile target card from a graveyard.