The Koraktor

{b}{t}: Search your library for a sorcery card with convertet mana costs X, where X is the number
of bone emblems you have.
{b}{t}, you lose six bone emblems: Search your
library for a human, wizard or skeleton creature.
You may cast it without paying its casting costs.
"Eleven and One listen and he reads aloud.
With cawing the raven choir repeats."