Gau, Feral Youth 
Legendary Creature — Human Berserker
$0.23 #8119 0.22 1.2 years
Rage — Whenever Gau attacks, put a +1/+1 counter on it.
At the beginning of each end step, if a card left your graveyard this turn, Gau deals damage equal to its power to each opponent.
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Cards similar to Gau, Feral Youth 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.
Alesha, Who Laughs at Fate87%
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"Whenever this card attacks, put a +1/+1 counter on it."
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$0.16↓#18445↓0.06↓5.4 years↑
"Whenever one or more cards leave your graveyard, this creature deals 1 damage to each opponent."
Krenko, Tin Street Kingpin85%
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"Whenever this card attacks, put a +1/+1 counter on it, then create a number of 1/1 red Goblin creature tokens equal to this card's power."
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$0.13↓#18440↓0.3113.6 years↑
"Whenever this creature attacks, put a +1/+1 counter on it for each attacking creature you control."
Resplendent Griffin80%
$0.13↓#28436↓0.00↓8.6 years↑
"Whenever this creature attacks, if you have the city's blessing, put a +1/+1 counter on it."
Iron Mastiff80%
$0.33↑#68270.00↓4.2 years↑
"This creature deals damage equal to its power to each opponent."
Ezio, Brash Novice79%
$0.19↓#12528↓0.76↑2.2 years
"Whenever this card attacks, put a +1/+1 counter on it."
Untethered Express78%
$0.23#12955↓0.00↓9.6 years↑
"Whenever this Vehicle attacks, put a +1/+1 counter on it."
Mortis Dogs78%
$0.08↓#27497↓0.2715.3 years↑
"Whenever this creature attacks, it gets +2/+0 until end of turn."
Heartfire Hero77%
$0.32↑#79340.33↑2.1 years
"When this creature dies, it deals damage equal to its power to each opponent."
Rhovanion Rampager76%
$0.28↑#16745↓0.00↓0.1 years↓
"Whenever this creature attacks, you may sacrifice another creature. If you do, put a number of +1/+1 counters on this creature equal to the sacrificed creature's power."
Predator Ooze76%
$0.18↓#6337↑0.11↓14.6 years↑
"Whenever this creature attacks, put a +1/+1 counter on it."
Casey Jones, Back Alley Brute76%
$0.31↑#76430.00↓0.5 years
"Whenever this card attacks, put a +1/+1 counter on target attacking creature."
+1 more matching line
Fangren Firstborn76%
$2.32↑#15553↓0.1722.6 years↑
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature."
Leatherhead, Iron Gator76%
$0.30↑#92210.00↓0.5 years
"Whenever this card attacks, put two +1/+1 counters on each creature you control."
Air Nomad Student75%
$0.17↓#24810↓0.00↓0.8 years
"At the beginning of your end step, if this creature didn't attack this turn, put a +1/+1 counter on it."
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"Whenever this creature attacks, target attacking creature gets +X/+0 until end of turn, where X is this creature's power."
Tuya Bearclaw74%
$0.26↑#10523↓0.245.8 years↑
"Whenever this card attacks, it gets +X/+X until end of turn, where X is the greatest power among other creatures you control."
Ash, Party Crasher74%
$0.15↓#15758↓0.06↓3.0 years↑
"Whenever this card attacks, if two or more nonland permanents entered the battlefield under your control this turn, put a +1/+1 counter on this card."
Descendant of Storms74%
$0.20↓#17904↓0.151.4 years
"Whenever this creature attacks, you may pay 
. If you do, it endures 1."
. If you do, it endures 1."