Seedglaive Mentor {1}{R}{W}
Creature — Mouse Soldier
Vigilance, haste
Valiant — Whenever this creature becomes the target of a spell or ability you control for the first time each turn, put a +1/+1 counter on it.
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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.
Heartfire Hero 100%
$0.25#7667
"Whenever this creature becomes the target of a spell or ability you control for the first time each turn, put a +1/+1 counter on it."
Angelic Cub 99%
$0.29#15444
"Whenever this creature becomes the target of a spell or ability for the first time each turn, put a +1/+1 counter on it."
Mossdog 92%
$0.15#27596
"Whenever this creature becomes the target of a spell or ability an opponent controls, put a +1/+1 counter on this creature."
Sage of Hours 84%
$12.39#7802
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Bloodcrazed Hoplite 84%
$0.09#25828
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Lagonna-Band Trailblazer 84%
$0.17#20778
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Fabled Hero 84%
$0.30#18364
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Snapping Sailback 82%
$0.22#14168
"Whenever this creature is dealt damage, put a +1/+1 counter on it."
Hidetsugu Consumes All // Vessel of the All-Consuming 80%
$0.60#13750
"Whenever this creature deals damage, put a +1/+1 counter on it."