Julieta, joy giver

Whenever you cast an Instant or sorcery spell
if you have 30 or more cards in Your graveyard
You may Draw 4 cards then mill 4 cards
{u}{u}{r}{t} create a copy of target creture
If it's power is 4 or less mill 3 cards if not
Instant and sorcery spells cost {2} less for
your turn discard a card
Partner