Lushen, Arcana Awakener

{x},{t}: Return target instant or sorcery card with
mana value X from your graveyard to the battlefield. Its an elemental creature with power
and toughness each equal to its mana value and
gains "When this creature enters the battlefield,
create a copy of a card with this creatures name
you may cast the copy without paying its mana
cost". When that creature dies put it on the
bottom of its owners library.