Teferi, Desparked

Instant and Sorcery spells you cast cost {u} less to cast
At the beginning of each opponents endstep draw a card if you cast a blue spell this turn
{u}, exile three Instants or Sorceries from your graveyard: return up to one card from your graveyard to your hand then put a +1 +1 counter on Teferi, Desparked for each spell you cast this turn. Activate this ability only during an opponents turn