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Você ganha 1 pontos de vida. A criatura alvo recebe -X/-X até o final do turno, sendo X a quantidade de pontos de vida que você ganhou neste turno.
Nightmare’s Thirst counts how much life you’ve gained this turn, not how much your life total changed. For example, if you’ve gained 5 life and lost 8 before Nightmare’s Thirst resolves, Nightmare’s Thirst has you gain 1 more life, then it gives the target creature -6/-6.
If the target creature is an illegal target when Nightmare’s Thirst tries to resolve, the spell doesn’t resolve. You won’t gain 1 life.