Energy Chamber 
Artifact
$4.27 #8929 0.50 22.4 years
At the beginning of your upkeep, choose one —
• Put a +1/+1 counter on target artifact creature.
• Put a charge counter on target noncreature artifact.
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Cards similar to Energy Chamber 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.
Power Conduit90%
$3.26↓#3141↑0.14↓23.0 years
"• Put a charge counter on target artifact."
+1 more matching line
Moxite Refinery87%
$0.23↓#5061↑0.06↓1.2 years↓
"• Put X charge counters on target artifact."
+1 more matching line
Vedalken Infuser87%
$0.07↓#22876↓0.24↓15.7 years↓
"At the beginning of your upkeep, you may put a charge counter on target artifact."
Coretapper85%
$0.28↓#5575↑0.00↓22.7 years
"
: Put a charge counter on target artifact."
: Put a charge counter on target artifact."+1 more matching line
Dismantle82%
$0.13↓#22382↓0.06↓22.7 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."
Surge Node80%
$0.22↓#17986↓0.00↓15.4 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."
Sylvan Scavenging77%
$0.25↓#6921↑0.16↓1.9 years↓
"At the beginning of your end step, choose one —"
+1 more matching line
Concord with the Kami76%
$0.28↓#13154↓0.00↓4.7 years↓
"At the beginning of your end step, choose one or more —"
+1 more matching line
Seedpod Caretaker76%
$0.33↓#20974↓0.00↓3.5 years↓
"• Put a +1/+1 counter on target artifact or creature you control."
+1 more matching line
Vannifar, Evolved Enigma75%
$0.42↓#84160.00↓2.7 years↓
"At the beginning of combat on your turn, choose one —"
Pollenbright Druid74%
$0.15↓#5699↑0.00↓7.5 years↓
"• Put a +1/+1 counter on target creature."
+1 more matching line
Inspirit, Flagship Vessel72%
$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."
Filigree Vector71%
$11.40↑#4853↑0.423.5 years↓
"When this creature enters, put a +1/+1 counter on each of any number of target creatures and a charge counter on each of any number of target artifacts."
Apothecary Stomper70%
$0.13↓#15989↓0.00↓1.9 years↓
"When this creature enters, choose one —"
+1 more matching line
Weldfast Engineer70%
$0.06↓#31645↓0.00↓9.7 years↓
"At the beginning of combat on your turn, target artifact creature you control gets +2/+0 until end of turn."