Plague Mare 
Creature — Nightmare Horse
$0.29 #15489 0.37 8.1 years
This creature can't be blocked by white creatures.
When this creature enters, creatures your opponents control get -1/-1 until end of turn.
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Cards similar to Plague Mare 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.
Sootwalkers95%
$0.08↓#31679↓0.07↓18.3 years↑
"This creature can't be blocked by white creatures."
Shivan Zombie91%
$0.16↓#29267↓0.3325.9 years↑
"Protection from white"
Ihsan's Shade91%
$0.16↓#25619↓0.50↑30.9 years↑
"Protection from white"
Mountain Yeti91%
$0.14↓#28876↓0.00↓32.3 years↑
"Protection from white"
Goblin Outlander91%
$0.11↓#28665↓0.25↓17.6 years↑
"Protection from white"
Cower in Fear91%
$0.14↓#155080.16↓14.1 years↑
"Creatures your opponents control get -1/-1 until end of turn."
Make Obsolete91%
$0.12↓#151670.12↓9.9 years↑
"Creatures your opponents control get -1/-1 until end of turn."
Arms of Hadar89%
$0.44↑#20205↓0.404.2 years↓
"Creatures target player controls get -2/-2 until end of turn."
Night Clubber88%
$0.22↓#137200.75↑4.4 years↓
"When this creature enters, creatures your opponents control get -1/-1 until end of turn."
Foundry Hornet88%
$0.25↓#25395↓0.339.6 years↑
"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."
Unchained Berserker88%
$0.08↓#30356↓0.22↓7.2 years
"Protection from white"
Voice of Truth88%
$0.23↓#28639↓0.25↓26.6 years↑
"Flying, protection from white"
Dauthi Horror88%
$0.26↓#9101↑0.18↓28.9 years↑
"This creature can't be blocked by white creatures."
Massacre Wurm87%
$1.69↑#512↑0.80↑15.6 years↑
"When this creature enters, creatures your opponents control get -2/-2 until end of turn."
Sephiroth, Planet's Heir86%
$0.63↑#10981↑0.55↑1.2 years↓
"When this card enters, creatures your opponents control get -2/-2 until end of turn."
Minister of Pain86%
$0.13↓#26067↓0.07↓11.4 years↑
"When this creature exploits a creature, creatures your opponents control get -1/-1 until end of turn."
Eviscerator85%
$0.49↑#30606↓0.00↓27.6 years↑
"Protection from white"
Suffocating Fumes85%
$0.20↓#148950.436.4 years↓
"Creatures your opponents control get -1/-1 until end of turn."
Disciple of Malice84%
$0.12↓#25547↓0.00↓23.9 years↑
"Protection from white"
White Scarab84%
$0.24↓#24896↓0.4231.3 years↑
"Enchanted creature can't be blocked by white creatures."