Looming Hoverguard 
Creature — Drone
$0.04 #32046 0.07 23.0 years
Flying
When this creature enters, put target artifact on top of its owner's library.
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Cards similar to Looming Hoverguard 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.
Run Aground92%
$0.15↑#261520.009.1 years↓
"Put target artifact or creature on top of its owner's library."
Vedalken Dismisser92%
$0.06↑#299520.1221.2 years↓
"When this creature enters, put target creature on top of its owner's library."
Disempower91%
$0.08↑#279760.33↑30.0 years↑
"Put target artifact or enchantment on top of its owner's library."
Natural Obsolescence90%
$0.05↑#257080.38↑9.7 years↓
"Put target artifact on the bottom of its owner's library."
Unlucky Drop90%
$0.09↑#264100.052.9 years↓
"Target artifact or creature's owner puts it on their choice of the top or bottom of their library."
Banishment Decree89%
$0.06↑#296200.21↑15.7 years↓
"Put target artifact, creature, or enchantment on top of its owner's library."
Rebuking Ceremony87%
$0.33↑#318200.1222.7 years
"Put two target artifacts on top of their owners' libraries."
Happy Hogan, Bodyguard85%
$0.19↑#291540.26↑0.3 years↓
"When this card enters, the owner of target creature an opponent controls puts it into their library second from the top or on the bottom."
Griptide84%
$0.05↑#24521↑0.0014.7 years↓
"Put target creature on top of its owner's library."
Time Ebb84%
$0.08↑#24080↑0.19↑29.5 years↑
"Put target creature on top of its owner's library."
Forced Retreat84%
$2.85↑#279790.18↑27.5 years↑
"Put target creature on top of its owner's library."
Repel84%
$0.14↑#290890.1125.1 years↑
"Put target creature on top of its owner's library."
Excommunicate84%
$0.02↓#277720.25↑18.0 years↓
"Put target creature on top of its owner's library."
Uproot82%
$0.06↑#299290.0021.7 years↓
"Put target land on top of its owner's library."
Fallow Earth82%
$0.14↑#310040.58↑30.0 years↑
"Put target land on top of its owner's library."
Unravel the Aether82%
$0.28↑#15768↑0.25↑12.7 years↓
"Choose target artifact or enchantment. Its owner shuffles it into their library."
Deglamer82%
$0.54↑#16922↑0.0618.7 years↓
"Choose target artifact or enchantment. Its owner shuffles it into their library."
Misleading Motes82%
$0.06↑#268490.063.1 years↓
"Target creature's owner puts it on their choice of the top or bottom of their library."
Chronostutter81%
$0.13↑#301100.0712.3 years↓
"Put target creature into its owner's library second from the top."
Isolation at Orthanc81%
$0.16↑#20763↑0.28↑3.3 years↓
"Put target creature into its owner's library second from the top."