Transmutation

Sacrifice an artifact to put another artifact from your graveyard with the same mana cost into your hand.

"Alchemy. It is the scientific technique of understanding the structure of matter, decomposing it, and then reconstructing it. If performed skillfully, it is even possible to create gold out of lead. However, as it is a science, there are some natural principles in place. Only one thing can be created from something else of a certain mass. This is the Principle of Equivalent Exchange."