Kelor, Narset’s Prodigy

Prowess, Vigilance, Lifelink
Whenever you cast an instant or sorcery spell from your hand, put the top five cards of
each players library into their graveyard,
then you may put one noncreature spell from any graveyard into your hand.
Then chose an instant or sorcery spell in any graveyard that has
converted mana cost three or less and cast it without paying its mana cost.