Geometric Nexus {2}
Artifact
Whenever a player casts an instant or sorcery spell, put a number of charge counters on this artifact equal to that spell's mana value.
{6}, {T}, Remove all charge counters from this artifact: Create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it, where X is the number of charge counters removed this way.
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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.
Primal Amulet // Primal Wellspring 84%
$13.51#2071
"Whenever you cast an instant or sorcery spell, put a charge counter on this artifact. Then if there are four or more charge counters on it, you may remove those counters and transform it."
Adaptive Training Post 83%
$0.24#8625
"Whenever you cast an instant or sorcery spell, if this artifact has fewer than three charge counters on it, put a charge counter on it."
+1 more matching line