Fogwalker 
Creature — Spirit
$0.09 #21289 0.33 10.1 years
Skulk (This creature can't be blocked by creatures with greater power.)
When this creature enters, target creature an opponent controls doesn't untap during its controller's next untap step.
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Cards similar to Fogwalker 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.
Rancid Rats97%
$0.18↑#8971↑0.20↓10.4 years
"Skulk"
Furtive Homunculus97%
$0.04↓#241020.06↓10.4 years
"Skulk"
Farbog Revenant96%
$0.09#215500.20↓10.4 years
"Skulk"
Vampire Cutthroat96%
$0.66↑#6768↑0.00↓10.1 years
"Skulk"
Pale Rider of Trostad96%
$0.09#26162↓0.07↓10.4 years
"Skulk"
Time Beetle90%
$0.36↑#8124↑0.21↓2.9 years↓
"Skulk"
Ingenious Prodigy88%
$0.31↑#3225↑0.11↓3.0 years↓
"Skulk"
Forgotten Creation88%
$0.22↑#3427↑0.15↓10.4 years
"Skulk"
Uninvited Geist // Unimpeded Trespasser87%
$0.09#239451.00↑10.4 years
"Skulk"
Gollum, Obsessed Stalker87%
$0.33↑#5026↑0.44↑3.2 years↓
"Skulk"
Startled Awake // Persistent Nightmare86%
$0.87↑#13882↑0.55↑10.4 years
"Skulk"
Skyline Cascade84%
$0.12↑#10094↑0.2410.9 years
"When this land enters, target creature an opponent controls doesn't untap during its controller's next untap step."
Gregor, Shrewd Magistrate84%
$4.91↑#12643↑0.405.9 years↓
"Skulk"
Wharf Infiltrator84%
$0.34↑#6505↑0.2410.1 years
"Skulk"
Misstep82%
$0.18↑#26613↓0.21↓26.9 years↑
"Creatures target player controls don't untap during that player's next untap step."
Frost Trickster82%
$0.10↑#175710.11↓5.4 years↓
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Spire Patrol82%
$0.21↑#28315↓0.18↓9.6 years
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Chillbringer82%
$0.05↓#26013↓0.06↓7.6 years↓
"When this creature enters, tap target creature an opponent controls. It doesn't untap during its controller's next untap step."
Watertrap Weaver81%
$0.06↓#222060.53↑8.9 years↓
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Frost Lynx81%
$0.04↓#197630.4112.1 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."