Chimeric Egg 
Artifact
Whenever an opponent casts a nonartifact spell, put a charge counter on this artifact.
Remove three charge counters from this artifact: This artifact becomes a 6/6 Construct artifact creature with trample until end of turn.
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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.
Golem Foundry 99%
$0.30#5783
"Remove three charge counters from this artifact: Create a 3/3 colorless Golem artifact creature token."
+1 more matching line
Talon of Pain 90%
$0.19#21603
"Whenever a source you control other than this artifact deals damage to an opponent, put a charge counter on this artifact."
+1 more matching line
Adaptive Training Post 89%
$0.24#8625
"Remove three charge counters from this artifact: When you next cast an instant or sorcery spell this turn, copy it and you may choose new targets for the copy."
+1 more matching line
Door of Destinies 88%
$2.32#1086
"Whenever you cast a spell of the chosen type, put a charge counter on this artifact."
+1 more matching line
Relic Amulet 85%
$0.09#19154
"Whenever you cast an instant, sorcery, or Wizard spell, put a charge counter on this artifact."
+1 more matching line
Angelheart Vial 84%
$0.39#17393
"Whenever you're dealt damage, you may put that many charge counters on this artifact."
Sun Droplet 84%
$0.41#10533
"Whenever you're dealt damage, put that many charge counters on this artifact."
+1 more matching line
Spawning Pit 83%
#4263
"{1}, Remove two charge counters from this artifact: Create a 2/2 colorless Spawn artifact creature token."