Karok Wrangler 

Creature — Elf Druid
Magecraft — Whenever you cast or copy an instant or sorcery spell, put a +1/+1 counter on target creature you control.
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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.
Quandrix Pledgemage 82%
$0.17#21223
"Whenever you cast or copy an instant or sorcery spell, put a +1/+1 counter on this creature."
Dragonsguard Elite 82%
$0.27#15967
"Whenever you cast or copy an instant or sorcery spell, put a +1/+1 counter on this creature."
Graduation Day 81%
$0.26#13993
"Whenever you cast an instant or sorcery spell that targets a creature, put a +1/+1 counter on target creature you control."
Scolding Administrator 81%
$0.20#18637
"Whenever you cast an instant or sorcery spell that targets a creature, put a +1/+1 counter on this creature."
Lecturing Scornmage 81%
$0.17#19036
"Whenever you cast an instant or sorcery spell that targets a creature, put a +1/+1 counter on this creature."
Caldera Pyremaw 81%
$0.28#4758
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature. Then this creature deals damage equal to its power to target opponent."
Electrostatic Infantry 80%
$0.30#6215
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."
Pyre Hound 80%
$0.17#18547
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."