Dumbledore,Hogwarts Head

{u}{b}{t}: Instant and Sorcery Spells cost {2} less this turn.

Whenever a Wizard enters under your control
or you Activate a Wizard Craft ability, Reveal cards from the top of your library until you Reveal and Instant or Sorcery Spell, Exile that Spell and put the revealed cards on the bottom
of your library in a random order, you may cast the exiled spell as long as you control a Wizard.