You gain 1 life. Target creature gets -X/-X until end of turn, where X is the amount of life you gained this turn.
That feeling of something on your chest is usually sleep paralysis. Occasionally, it's something else.
Legalities
tlrlegal
duellegal
brawllegal
pennynot legal
PreDH
Rulings · 2
wotc
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.
wotc
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.
Notes
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