Sphere of the Archmage

Wizard creature spells cost {2} more to cast.
Whenever you cast a Wizard creature spell, you may cast target instant or sorcery card in your graveyard with an equal or lesser converted mana cost without paying its mana cost.
"Starting now you will be pushed well beyond your limits. If you rise to the challenge, you may be among the few to master sorceries you can scarcely dream of."
-Jodah, to the neophytes at Tolaria West