Tirek's Amulet

{5}{t} Sacrifice a creature: Search your library for a instant or sorcery with converted mana cost X and put it into your hand, X being the creature's power. Shuffle your library afterwards.
"Here, I want you to have something. This was given to me by someone very close to me. I give it to you as a sign of my gratitude and loyalty."
- Lord Tirek