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Return up to two target creature cards from your graveyard to your hand. Each opponent loses 2 life and you gain 2 life.
You may cast Hazel's Nocturne with no targets just to have each opponent lose 2 life and you gain 2 life. However, if you do choose any targets, and all those targets are illegal as Hazel's Nocturne tries to resolve, it won't resolve and none of its effects will happen. No player will lose or gain life.
