Long-Range Sensor 

Artifact
$0.27 #5160 0.04 1.1 years
Whenever you attack a player, put a charge counter on this artifact.
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Cards similar to Long-Range Sensor 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.
Druids' Repository78%
$3.23↑#7042↓0.29↑14.3 years↑
"Whenever a creature you control attacks, put a charge counter on this enchantment."
Geological Appraiser76%
$0.29↑#13223↓0.62↑2.8 years↑
"When this creature enters, if you cast it, discover 3."
Chimil, the Inner Sun76%
$9.64↑#759↑0.74↑2.8 years↑
"At the beginning of your end step, discover 5."
Trigon of Thought74%
$0.09↓#29345↓0.27↑15.9 years↑
"
,
, Remove a charge counter from this artifact: Draw a card."
+1 more matching line
Brain in a Jar73%
$0.30↑#18850↓0.0710.4 years↑
"
,
: Put a charge counter on this artifact, then you may cast an instant or sorcery spell with mana value equal to the number of charge counters on this artifact from your hand without paying its mana cost."
Digsite Conservator72%
$0.10↓#19188↓0.31↑2.8 years↑
"When this creature dies, you may pay
. If you do, discover 4."
Hidden Necropolis72%
$0.19↓#57860.012.8 years↑
"
,
, Sacrifice this land: Discover 4. Activate only as a sorcery."
Serum Tank72%
$0.16↓#23102↓0.24↑22.9 years↑
"Whenever this artifact or another artifact enters, put a charge counter on this artifact."
+1 more matching line
Hidden Courtyard72%
$0.26↓#55500.092.8 years↑
"
,
, Sacrifice this land: Discover 4. Activate only as a sorcery."
Hidden Nursery72%
$0.21↓#3592↑0.052.8 years↑
"
,
, Sacrifice this land: Discover 4. Activate only as a sorcery."
Hidden Cataract72%
$0.17↓#51750.082.8 years↑
"
,
, Sacrifice this land: Discover 4. Activate only as a sorcery."
Hidden Volcano71%
$0.16↓#3887↑0.082.8 years↑
"
,
, Sacrifice this land: Discover 4. Activate only as a sorcery."
Franklin Richards, Ascendant71%
$0.28↑#15365↓0.000.2 years
"At the beginning of combat on your turn, if you've cast a noncreature spell this turn, discover 6."
Hit the Mother Lode71%
$0.33↑#1813↑0.29↑2.8 years↑
"Discover 10. If the discovered card's mana value is less than 10, create a number of tapped Treasure tokens equal to the difference."
Angelheart Vial70%
$0.40↑#17585↓0.22↑16.4 years↑
"Whenever you're dealt damage, you may put that many charge counters on this artifact."
+1 more matching line
Buried Treasure70%
$0.21↓#13706↓0.002.8 years↑
"
, Exile this card from your graveyard: Discover 5. Activate only as a sorcery."