Veya, Mistress of Memories

Whenever a player casts an instant or sorcery,
you may exile a number of cards from your
graveyard equal to that spell's converted mana
cost. If you do, copy that spell. You may choose
new targets for the copy.
Whenever a nontoken creature dies, you may
exile a number of cards from your graveyard
equal to that creature's converted mana cost. If
you do, create a token that is a copy of that
creature.