Necrotic Wound 
Instant
Undergrowth — Target creature gets -X/-X until end of turn, where X is the number of creature cards in your graveyard. If that creature would die this turn, exile it instead.
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Cards that do something similar expected a card that isn't here?
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Ob Nixilis's Cruelty 90%
$0.09#17411
"Target creature gets -5/-5 until end of turn. If that creature would die this turn, exile it instead."
Faerie Fencing 90%
$0.26#7966
"Target creature gets -X/-X until end of turn. That creature gets an additional -3/-3 until end of turn if you controlled a Faerie as you cast this spell."
Timely Interference 89%
$0.14#22156
"Target creature gets -1/-0 until end of turn. If this spell was kicked, that creature blocks this turn if able."
Festive Funeral 88%
$0.15#25339
"Target creature gets -X/-X until end of turn, where X is the number of cards in your graveyard."
Take the Fall 88%
$0.13#14685
"Target creature gets -1/-0 until end of turn. It gets -4/-0 until end of turn instead if you control an outlaw."
Eye Gouge 87%
$0.06#28161
"Target creature gets -1/-1 until end of turn. If it's a Cyclops, destroy it."
Fungal Infection 87%
$0.15#15270
"Target creature gets -1/-1 until end of turn. Create a 1/1 green Saproling creature token."
Induce Despair 87%
$0.10#27835
"Target creature gets -X/-X until end of turn, where X is the revealed card's mana value."