Cat-Owl 

Creature — Cat Bird
$0.12 #18513 0.20 0.9 years
Flying
Whenever this creature attacks, untap target artifact or creature.
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Cards similar to Cat-Owl 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.
Mobile Garrison93%
$0.30↑#10922↑0.05↓9.7 years↑
"Whenever this Vehicle attacks, untap another target artifact or creature you control."
Triceraton Regenta91%
$0.23↑#30216↓0.150.6 years
"Whenever this creature attacks, untap up to one other target creature."
Dauntless Aven90%
$0.21↑#210860.06↓9.3 years↑
"Whenever this creature attacks, untap target creature you control."
Tenth District Veteran90%
$0.05↓#25592↓0.00↓7.7 years↑
"Whenever this creature attacks, untap another target creature you control."
Militia Rallier85%
$0.13↑#26524↓0.00↓4.9 years↑
"Whenever this creature attacks, untap target creature."
Bazaar Krovod84%
$0.08↓#29587↓0.00↓14.0 years↑
"Whenever this creature attacks, another target attacking creature gets +0/+2 until end of turn. Untap that creature."
Corridor Monitor84%
$0.10↓#9079↑0.157.0 years↑
"When this creature enters, untap target artifact or creature you control."
Voltaic Servant84%
$0.20↑#10361↑0.04↓8.5 years↑
"At the beginning of your end step, untap target artifact."
Inverted Iceberg // Iceberg Titan82%
$0.14↑#14415↑0.202.9 years↑
"Whenever this creature attacks, you may tap or untap target artifact or creature."
Jangling Automaton81%
$0.14↑#22498↓0.2029.4 years↑
"Whenever this creature attacks, untap all creatures defending player controls."
Copperhorn Scout79%
$0.25↑#5634↑0.62↑16.1 years↑
"Whenever this creature attacks, untap each other creature you control."
Thistledown Players79%
$0.23↑#12874↑0.00↓2.2 years↑
"Whenever this creature attacks, untap target nonland permanent."
Civic Gardener76%
$0.16↑#198200.06↓4.5 years↑
"Whenever this creature attacks, untap target creature or land."