Coretapper 
Artifact Creature — Myr
$0.28 #5575 0.00 22.7 years
: Put a charge counter on target artifact.Sacrifice this creature: Put two charge counters on target artifact.
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Cards similar to Coretapper 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.
Vedalken Infuser94%
$0.07↓#22876↓0.24↑15.7 years↓
"At the beginning of your upkeep, you may put a charge counter on target artifact."
Surge Node92%
$0.22↓#17986↓0.0015.4 years↓
"
, , Remove a charge counter from this artifact: Put a charge counter on target artifact."
, , Remove a charge counter from this artifact: Put a charge counter on target artifact."+1 more matching line
Energy Chamber85%
$4.27↑#8929↓0.50↑22.4 years
"• Put a charge counter on target noncreature artifact."
+1 more matching line
Dismantle83%
$0.13↓#22382↓0.0622.7 years
"Destroy target artifact. If that artifact had counters on it, put that many +1/+1 counters or charge counters on an artifact you control."
Power Conduit82%
$3.26↑#3141↑0.14↑23.0 years
"• Put a charge counter on target artifact."
Moxite Refinery78%
$0.23↓#50610.061.2 years↓
"• Put X charge counters on target artifact."
Inspirit, Flagship Vessel76%
$0.48↑#3522↑0.38↑1.2 years↓
"At the beginning of combat on your turn, put your choice of a +1/+1 counter or two charge counters on up to one other target artifact."
Myr Scrapling71%
$0.26↓#9461↓0.055.3 years↓
"Sacrifice this creature: Put a +1/+1 counter on target creature."
Pteron Ghost70%
$0.06↓#27432↓0.0022.7 years
"Sacrifice this creature: Regenerate target artifact."