Nightmare's Thirst

Instant    (CMC:1)

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.

111 M19 • ENIgor Kieryluk

™ & © 1993— Wizards of the Coast

Notes: TODO: Update Copyright

Legal in: Pioneer,Modern,Legacy,Vintage,Commander

Oracle Text (click to copy):

Nightmare's Thirst {B} Instant You gain 1 life. Target creature gets -X/-X until end of turn, where X is the amount of life you gained this turn.

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View this MTG card on Gatherer

7/13/2018
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.
7/13/2018
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.

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