Nebelgast Herald 
Creature — Spirit
$0.12 #11516 0.06 10.2 years
Flash
Flying
Whenever this creature or another Spirit you control enters, tap target creature an opponent controls.
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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%
$0.26↑#20535↓0.33↑12.3 years↑
"Whenever this creature or another creature you control enters, tap target creature an opponent controls."
+1 more matching line
Oyobi, Who Split the Heavens86%
$0.31↑#128400.20↑21.7 years↑
"Flying"
Supreme Phantom85%
$0.33↑#97950.068.3 years↓
"Flying"
Deathknell Kami83%
$0.07↓#27710↓0.0021.4 years↑
"Flying"
Returned Pastcaller82%
$0.15↑#22610↓0.47↑5.5 years↓
"Flying"
Baboon Spirit78%
$0.29↑#17198↓0.17↑0.9 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.""
Shacklegeist78%
$0.26↑#128580.41↑6.3 years↓
"Tap two untapped Spirits you control: Tap target creature you don't control."
Zhalfirin Decoy78%
$0.19↑#29188↓0.16↑7.4 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%
$0.10↓#26168↓0.0622.1 years↑
"Whenever you cast a Spirit or Arcane spell, you may tap or untap target creature."
Thieves' Guild Enforcer78%
$0.31↑#93050.24↑6.3 years↓
"Flash"
Drogskol Cavalry78%
$0.36↑#14124↓0.1010.5 years
"Whenever another Spirit you control enters, you gain 2 life."
Lossarnach Captain76%
$0.40↑#3835↑0.43↑3.3 years↓
"Whenever this creature or another Human you control enters, tap target creature an opponent controls."
Kor Entanglers76%
$0.10↓#18567↓0.35↑11.0 years
"Whenever this creature or another Ally you control enters, tap target creature an opponent controls."
Shambleshark76%
$0.21↑#20123↓0.0013.7 years↑
"Flash"
Bounding Krasis76%
$0.14↑#18079↓0.28↑11.3 years↑
"Flash"
Storm Elemental76%
$0.15↑#31865↓0.19↑30.4 years↑
"Flying"
Apothecary Geist75%
$0.05↓#24547↓0.0010.5 years
"When this creature enters, if you control another Spirit, you gain 3 life."
Court Street Denizen74%
$0.12#7663↑0.59↑13.7 years↑
"Whenever another white creature you control enters, tap target creature an opponent controls."
Harrier Griffin74%
$0.13↑#25786↓0.18↑20.7 years↑
"At the beginning of your upkeep, tap target creature."
Salvation Swan74%
$0.31↑#8245↑0.25↑2.2 years↓
"Flash"