Abyssal Nocturnus 
Creature — Horror
$0.69 #20298 0.38 20.7 years
Whenever an opponent discards a card, this creature gets +2/+2 and gains fear until end of turn. (It can't be blocked except by artifact creatures and/or black creatures.)
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Cards similar to Abyssal Nocturnus expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Face of Fear78%
$0.22↓#31813↓0.2925.1 years↑
"
, Discard a card: This creature gains fear until end of turn."
, Discard a card: This creature gains fear until end of turn."
Sangromancer76%
$0.76↑#2036↑0.3315.7 years↓
"Whenever an opponent discards a card, you may gain 3 life."
Liliana's Caress76%
$5.10↑#2409↑0.59↑16.3 years↓
"Whenever an opponent discards a card, that player loses 2 life."
Confessor74%
$0.22↓#184880.21↓25.1 years↑
"Whenever a player discards a card, you may gain 1 life."
Hooded Kavu74%
$0.17↓#31138↓0.00↓26.0 years↑
": This creature gains fear until end of turn."
: This creature gains fear until end of turn."
Tourach, Dread Cantor72%
$0.52↓#6170↑0.59↑5.5 years↓
"Whenever an opponent discards a card, put a +1/+1 counter on this card."
Geth's Grimoire72%
$8.38↑#2317↑0.49↑22.7 years↑
"Whenever an opponent discards a card, you may draw a card."
Fell Specter72%
$0.35↓#4911↑0.05↓8.3 years↓
"Whenever an opponent discards a card, that player loses 2 life."
Nath of the Gilt-Leaf71%
$3.10↑#13035↑0.61↑19.0 years↓
"Whenever an opponent discards a card, you may create a 1/1 green Elf Warrior creature token."
Vulturous Zombie71%
$0.35↓#167470.19↓21.0 years
"Whenever a card is put into an opponent's graveyard from anywhere, put a +1/+1 counter on this creature."
Spirit Cairn70%
$0.16↓#212500.3124.4 years↑
"Whenever a player discards a card, you may pay 
. If you do, create a 1/1 white Spirit creature token with flying."
. If you do, create a 1/1 white Spirit creature token with flying."