Jace, Spark Surrendered

When Jace of the Surrendered Spark enters the battlefield, draw 3 cards, then discard a card.
Instants and sorceries you cast cost {u} less to cast.
Whenever you cast a spell, target player puts the top card of their library into their graveyard.
"I may not be a planeswalker anymore, but I am still the most powerful mind mage in the multiverse."