Patchwork Automaton 
Artifact Creature — Construct
Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.)
Whenever you cast an artifact spell, put a +1/+1 counter on this creature.
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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.
Citanul Druid 88%
#27770
"Whenever an opponent casts an artifact spell, put a +1/+1 counter on this creature."
Levitating Statue 85%
$0.12#17323
"Whenever you cast a noncreature spell, put a +1/+1 counter on this artifact."
Gleaming Geardrake 81%
$0.22#9615
"Whenever you sacrifice an artifact, put a +1/+1 counter on this creature."
Magnetic Snuffler 81%
$0.11#18253
"Whenever you sacrifice an artifact, put a +1/+1 counter on this creature."