Trigon of Thought 
Artifact
This artifact enters with three charge counters on it.
{U}{U}, {T}: Put a charge counter on this artifact.
{2}, {T}, Remove a charge counter from this artifact: Draw a card.
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Cards that do something similar 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.
Serum Tank 98%
$0.44#22735
"{3}, {T}, Remove a charge counter from this artifact: Draw a card."
+1 more matching line
Insight Engine 87%
$0.83#2695
"{2}, {T}: Put a charge counter on this artifact, then draw a card for each charge counter on it."
Conversion Chamber 87%
$0.10#23220
"{2}, {T}, Remove a charge counter from this artifact: Create a 3/3 colorless Phyrexian Golem artifact creature token."
Blue Mana Battery 85%
$0.65#24676
"{2}, {T}: Put a charge counter on this artifact."
+1 more matching line
Magistrate's Scepter 85%
$3.42#5640
"{4}, {T}: Put a charge counter on this artifact."
+1 more matching line
Jeweled Amulet 84%
#3622
"{1}, {T}: Put a charge counter on this artifact. Note the type of mana spent to pay this activation cost. Activate only if there are no charge counters on this artifact."
+1 more matching line
Trigon of Infestation 80%
$0.21#22876
"{2}, {T}, Remove a charge counter from this artifact: Create a 1/1 green Phyrexian Insect creature token with infect."
+2 more matching lines
Surge Node 80%
$0.36#17588
"{1}, {T}, Remove a charge counter from this artifact: Put a charge counter on target artifact."
+1 more matching line
Trigon of Rage 100%
$0.10#30486
"This artifact enters with three charge counters on it."
+1 more matching line
Trigon of Mending 100%
$0.06#29681
"This artifact enters with three charge counters on it."
+1 more matching line
Trigon of Corruption 100%
$0.17#23618
"This artifact enters with three charge counters on it."
+1 more matching line