Noqra, Master of Ruins

{u}, {t}: You get a study counter. You may return
Noqra, Master of Ruins to your hand.
You may pay {r} instead of paying the mana cost
of the first instant or sorcery spell you cast on
each of your turns with converted mana cost
equal to the number of study counters you have.
When Noqra, Master of Ruins dies or is exiled,
you lose all study counters.