Heartfire Hero 
Creature — Mouse Soldier
$0.30 #8014 0.21 2.2 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%
$1.77↑#4218↑0.32↑2.6 years
"When this creature dies, each opponent gets a number of rad counters equal to its power."
Flaming Tyrannosaurus88%
$8.43↑#3179↑0.36↑3.0 years
"When this creature dies, it deals damage equal to its power to each opponent."
Angelic Cub82%
$0.30#15886↓0.00↓3.9 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%
$0.17↓#16780↓0.06↓5.3 years↑
"When this creature dies, you gain life equal to its power."
Mortis Dogs80%
$0.13↓#27869↓0.00↓15.4 years↑
"When this creature dies, target player loses life equal to its power."
Satyr Hoplite80%
$0.13↓#21251↓0.07↓12.5 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Dreadhorde Butcher80%
$0.34↑#13226↓0.277.5 years↑
"When this creature dies, it deals damage equal to its power to any target."
War-Wing Siren80%
$0.06↓#28251↓0.00↓12.5 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Akroan Skyguard80%
$0.13↓#19676↓0.00↓12.7 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."
Centaur Battlemaster80%
$0.07↓#26566↓0.06↓13.1 years↑
"Whenever you cast a spell that targets this creature, put three +1/+1 counters on this creature."
Setessan Oathsworn80%
$0.16↓#23889↓0.1112.7 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Pheres-Band Thunderhoof80%
$0.13↓#29546↓0.07↓12.5 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Staunch-Hearted Warrior80%
$0.03↓#28363↓0.00↓13.1 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Lagonna-Band Trailblazer80%
$0.12↓#21221↓0.06↓12.5 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Fabled Hero80%
$0.29↓#19015↓0.00↓13.1 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Evereth, Viceroy of Plunder79%
$3.35↑#75310.32↑1.9 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%
$0.29↓#95250.44↑3.3 years↑
"Whenever you cast a spell that targets this card, put a +1/+1 counter on this card."
Task Force78%
$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."
Faerie Bladecrafter78%
$4.38↑#6134↑0.253.1 years
"When this creature dies, each opponent loses X life and you gain X life, where X is its power."