Integrity

If the chosen target is an illegal target by the time Intervention tries to resolve, the spell doesn't resolve. You don't gain 3 life.

To cast a split card, choose one of its halves to cast. There's no way to cast both halves of this split card.

Each split card is a single card. For example, if you discard a split card, you've discarded one card, not two. If an effect counts the number of sorcery cards in your graveyard, Assault // Battery counts once, not twice.