Miu, Study Partner

Companion — Each instant or sorcery card in
your starting deck is a Lesson or has learn. (If
this card is your chosen companion, you may put it
into your hand from outside the game for {3} as a
sorcery.)
Whenever you cast a spell with learn, copy it.
You may choose new targets for the copy.
Whenever you cast your fourth Lesson spell each
turn, take an extra turn after this one.