Fangs of Kalonia {1}{G}
Sorcery
Put a +1/+1 counter on target creature you control, then double the number of +1/+1 counters on each creature that had a +1/+1 counter put on it this way.
Overload {4}{G}{G} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")
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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.
Invigorating Surge 90%
$0.25#3468
"Put a +1/+1 counter on target creature you control, then double the number of +1/+1 counters on that creature."
Growth Curve 90%
$0.26#11853
"Put a +1/+1 counter on target creature you control, then double the number of +1/+1 counters on that creature."
Lifecrafter's Gift 86%
$0.20#15528
"Put a +1/+1 counter on target creature, then put a +1/+1 counter on each creature you control with a +1/+1 counter on it."
Study the Classics 83%
$0.34#16605
"Put a +1/+1 counter on target creature, then double the number of +1/+1 counters on it. You gain life equal to the number of +1/+1 counters on that creature."