Malevolent Tutor

Search target library for a card, exile that card, then it's owner shuffles his or her library. You get an emblem with, "Sacrifice this emblem: You may cast a card exiled with Malevolent Tutor and you may spend mana as though it were mana of any color to cast it."
"There are only two things that matter. What doesn't exist, and what is mine." Nicol Bolas.