Veteran Guardmouse 

Creature — Mouse Soldier
$0.16 #13771 0.22 2.2 years
Valiant — Whenever this creature becomes the target of a spell or ability you control for the first time each turn, it gets +1/+0 and gains first strike until end of turn. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)
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Cards similar to Veteran Guardmouse 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.
Chorus of the Tides84%
$0.07↓#30312↓0.2512.7 years↑
"Whenever you cast a spell that targets this creature, scry 1."
Tenth District Legionnaire82%
$0.17↑#163660.06↓7.5 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature, then scry 1."
Trained Arynx82%
$0.16#19894↓0.00↓2.5 years
"Whenever this creature attacks while saddled, it gains first strike until end of turn. Scry 1."
Faithful Pikemaster80%
$0.12↓#27843↓0.00↓1.9 years
"As long as it's your turn, this creature has first strike."
Battlewise Hoplite78%
$0.06↓#25710↓0.00↓13.1 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature, then scry 1."
Colleen Wing, Street Samurai78%
$0.23↑#20121↓0.160.3 years↓
"Whenever you cast a spell that targets a creature you control, put a +1/+1 counter on this card. Scry 1."
Hawkeye, Bowslinger78%
$0.30↑#24149↓0.190.3 years↓
"Whenever you cast a spell that targets a creature, put a +1/+1 counter on this card. Scry 1."
Task Force74%
$0.20↑#24699↓0.05↓27.0 years↑
"Whenever this creature becomes the target of a spell or ability, it gets +0/+3 until end of turn."
Prickleboar74%
$0.05↓#29597↓0.00↓11.3 years↑
"During your turn, this creature gets +2/+0 and has first strike."
Ruin-Lurker Bat74%
$0.37↑#8471↑0.00↓2.9 years
"At the beginning of your end step, if you descended this turn, scry 1."
Angelic Protector74%
$0.18↑#25498↓0.00↓29.0 years↑
"Whenever this creature becomes the target of a spell or ability, this creature gets +0/+3 until end of turn."
Seedglaive Mentor74%
$0.22↑#116970.00↓2.2 years
"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."
Fresh-Faced Recruit73%
$0.07↓#25089↓0.05↓8.0 years↑
"During your turn, this creature has first strike."
Flamespeaker Adept72%
$0.03↓#30972↓0.11↓13.1 years↑
"Whenever you scry, this creature gets +2/+0 and gains first strike until end of turn."