Ava Max, on Repeat

When Ava Max, on Repeat attacks,
choose an instant or sorcery card in exile.
You May cast that card for free.
Cards casted this way remain in exile.
Whenever you resolve an instant or sorcery
card from exile, if no mana was spent to cast it;
choose an instant or sorcery card in exile.
You may cast that card for free.
Cards casted this way remain in exile.