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Finality doesn't target the creature to receive +1/+1 counters. You can cast it even if you control no creatures.

Finality affects only creatures on the battlefield at the time it resolves. Creatures that enter the battlefield later in the turn won't get -4/-4.

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.