Foundry Hornet 
Creature — Insect
$0.21 #25736 0.06 9.7 years
Flying
When this creature enters, if you control a creature with a +1/+1 counter on it, creatures your opponents control get -1/-1 until end of turn.
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Cards similar to Foundry Hornet 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.
Plague Mare88%
$0.28↑#16023↑0.138.3 years↓
"When this creature enters, creatures your opponents control get -1/-1 until end of turn."
Make Obsolete86%
$0.14↓#15749↑0.22↑10.1 years
"Creatures your opponents control get -1/-1 until end of turn."
Cower in Fear86%
$0.15↓#16060↑0.0514.3 years↑
"Creatures your opponents control get -1/-1 until end of turn."
Night Clubber85%
$0.28↑#14238↑0.20↑4.5 years↓
"When this creature enters, creatures your opponents control get -1/-1 until end of turn."
Sephiroth, Planet's Heir84%
$0.44↑#10885↑0.60↑1.4 years↓
"When this card enters, creatures your opponents control get -2/-2 until end of turn."
Massacre Wurm84%
$1.94↑#514↑0.88↑15.7 years↑
"When this creature enters, creatures your opponents control get -2/-2 until end of turn."
Minister of Pain84%
$0.07↓#265870.1111.6 years↑
"When this creature exploits a creature, creatures your opponents control get -1/-1 until end of turn."
Shockmaw Dragon84%
$0.21#221780.1211.7 years↑
"Flying"
Arms of Hadar84%
$0.53↑#206940.25↑4.4 years↓
"Creatures target player controls get -2/-2 until end of turn."
Archfiend of Sorrows82%
$0.12↓#15229↑0.47↑5.3 years↓
"When this creature enters, creatures your opponents control get -2/-2 until end of turn."
Suffocating Fumes81%
$0.20↓#15331↑0.066.5 years↓
"Creatures your opponents control get -1/-1 until end of turn."
Seeker's Folly80%
$0.12↓#14351↑0.28↑1.9 years↓
"• Creatures your opponents control get -1/-1 until end of turn."
Scavenger Regent // Exude Toxin80%
$0.45↑#6051↑0.28↑1.5 years↓
"Flying"
Hazardous Conditions80%
$0.06↓#289960.40↑10.1 years
"Creatures with no counters on them get -2/-2 until end of turn."
Shrouded Shepherd // Cleave Shadows79%
$0.18↓#237630.003.1 years↓
"Creatures your opponents control get -1/-1 until end of turn."
Gruesome Realization78%
$0.17↓#10711↑0.063.9 years↓
"• Creatures your opponents control get -1/-1 until end of turn."
Gnashing of Teeth78%
$0.14↓#18884↑0.19↑0.2 years↓
"• Creatures target player controls get -1/-1 until end of turn."
Miasma Demon78%
$0.19↓#19947↑0.052.1 years↓
"Flying"
Arcbound Stinger77%
$0.21#8338↑0.0022.7 years↑
"Flying"
Dream Spoilers77%
$0.14↓#19623↑0.25↑3.1 years↓
"Flying"