Apollo, Bushi of Minamo

Apollo, Bushi of Minamo cost {1} less for each
instant and sorcery card in your graveyard.
When Apollo enters the battlefield draw 7 cards.
Discard 3 cards: Deal 3 damage any target.
Whenever you discard one or more cards, you
may cast a random instant or sorcery card from
your graveyard without paying its mana cost,
exile it as it resolves.