Heartfire Hero 
Creature — Mouse Soldier
$0.32 #7934 0.33 2.1 years
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.
When this creature dies, it deals damage equal to its power to each opponent.
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Cards similar to Heartfire Hero 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.
Seedglaive Mentor93%
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"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."
Feral Ghoul90%
$2.57↑#4128↑0.19↓2.5 years
"When this creature dies, each opponent gets a number of rad counters equal to its power."
Flaming Tyrannosaurus88%
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"When this creature dies, it deals damage equal to its power to each opponent."
Angelic Cub82%
$0.26↓#15602↓0.20↓3.8 years↑
"Whenever this creature becomes the target of a spell or ability for the first time each turn, put a +1/+1 counter on it."
Bottle Golems82%
$0.24↓#16539↓0.06↓5.2 years↑
"When this creature dies, you gain life equal to its power."
Faerie Bladecrafter80%
$3.94↑#6052↑0.00↓3.0 years
"When this creature dies, each opponent loses X life and you gain X life, where X is its power."
Satyr Hoplite80%
$0.13↓#21092↓0.44↑12.3 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Mortis Dogs80%
$0.08↓#27497↓0.2715.3 years↑
"When this creature dies, target player loses life equal to its power."
War-Wing Siren80%
$0.07↓#27997↓0.2912.3 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Akroan Skyguard80%
$0.11↓#19504↓0.2912.6 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Centaur Battlemaster80%
$0.06↓#26240↓0.3212.9 years↑
"Whenever you cast a spell that targets this creature, put three +1/+1 counters on this creature."
Setessan Oathsworn80%
$0.14↓#23753↓0.12↓12.6 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Pheres-Band Thunderhoof80%
$0.08↓#29215↓0.22↓12.3 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Staunch-Hearted Warrior80%
$0.03↓#28035↓0.2612.9 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Lagonna-Band Trailblazer80%
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"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Fabled Hero80%
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"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Dreadhorde Butcher80%
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"When this creature dies, it deals damage equal to its power to any target."
Evereth, Viceroy of Plunder79%
$3.18↑#76700.44↑1.8 years
"When this card dies, you may pay 
. When you do, this card deals damage equal to its power to each opponent."
. When you do, this card deals damage equal to its power to each opponent."
Legolas, Master Archer79%
$0.41↑#94300.00↓3.2 years↑
"Whenever you cast a spell that targets this card, put a +1/+1 counter on this card."
Willow Geist78%
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"When this creature dies, you gain life equal to its power."