Nebelgast Herald 
Creature — Spirit
$0.11 #11325 0.40 10.1 years
Flash
Flying
Whenever this creature or another Spirit you control enters, tap target creature an opponent controls.
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Cards similar to Nebelgast Herald 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.
Kapsho Kitefins86%
$0.22↑#20262↓0.14↓12.1 years↑
"Whenever this creature or another creature you control enters, tap target creature an opponent controls."
Mantle of Leadership86%
$0.28↑#23135↓0.27↓19.6 years↑
"Flash"
Drogskol Cavalry83%
$0.38↑#13902↓0.29↓10.4 years
"Whenever another Spirit you control enters, you gain 2 life."
+1 more matching line
Umara Raptor83%
$0.14↑#17940↓0.00↓16.9 years↑
"Flying"
He Who Hungers82%
$0.58↑#18048↓0.60↑21.9 years↑
"Flying"
Patrician Geist80%
$0.17↑#103020.06↓4.9 years↓
"Flying"
Shacklegeist78%
$0.21↑#126780.62↑6.2 years↓
"Tap two untapped Spirits you control: Tap target creature you don't control."
Zhalfirin Decoy78%
$0.19↑#28856↓0.05↓7.2 years↓
"
: Tap target creature. Activate only if you had a creature enter the battlefield under your control this turn."
: Tap target creature. Activate only if you had a creature enter the battlefield under your control this turn."
Teller of Tales78%
$0.11#25890↓0.14↓21.9 years↑
"Whenever you cast a Spirit or Arcane spell, you may tap or untap target creature."
Velvetwing Butterflies // Gaze in Wonder78%
$0.14↑#26458↓0.00↓0.1 years↓
"Flying"
Welcoming Vampire78%
$1.94↑#424↑0.22↓4.8 years↓
"Flying"
Niblis of the Breath78%
$0.28↑#17509↓0.4014.6 years↑
"Flying"
Scourge of Valkas77%
$3.43↑#1527↑0.4513.1 years↑
"Flying"
Lossarnach Captain76%
$0.38↑#3793↑0.333.2 years↓
"Whenever this creature or another Human you control enters, tap target creature an opponent controls."
Kor Entanglers76%
$0.09↓#18268↓0.4010.9 years
"Whenever this creature or another Ally you control enters, tap target creature an opponent controls."
Obyra, Dreaming Duelist76%
$0.34↑#3406↑0.24↓3.0 years↓
"Flash"
Baboon Spirit76%
$0.25↑#17390↓0.00↓0.8 years↓
"Whenever another nontoken Spirit you control enters, create a 1/1 colorless Spirit creature token with "This token can't block or be blocked by non-Spirit creatures.""
Bounding Krasis76%
$0.12↑#17755↓0.29↓11.1 years↑
"Flash"
Shambleshark76%
$0.20↑#20561↓0.29↓13.6 years↑
"Flash"
Apothecary Geist75%
$0.04↓#24456↓0.71↑10.4 years
"When this creature enters, if you control another Spirit, you gain 3 life."