Ezio, Brash Novice 

Legendary Creature — Human
$0.19 #12528 0.76 2.2 years
Whenever Ezio attacks, put a +1/+1 counter on it.
As long as Ezio has two or more counters on it, it has first strike and is an Assassin in addition to its other types.
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Cards similar to Ezio, Brash Novice 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.
Resplendent Griffin86%
$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."
Rubblebelt Raiders86%
$0.13↓#18440↓0.31↓13.6 years↑
"Whenever this creature attacks, put a +1/+1 counter on it for each attacking creature you control."
Triumphant Adventurer84%
$0.32↑#9022↑0.735.1 years↑
"Whenever this creature attacks, venture into the dungeon."
+1 more matching line
Untethered Express84%
$0.23↑#129550.00↓9.6 years↑
"Whenever this Vehicle attacks, put a +1/+1 counter on it."
Leatherhead, Iron Gator81%
$0.30↑#9221↑0.00↓0.5 years↓
"Whenever this card attacks, put two +1/+1 counters on each creature you control."
Predator Ooze80%
$0.18↓#6337↑0.11↓14.6 years↑
"Whenever this creature attacks, put a +1/+1 counter on it."
Fangren Firstborn80%
$2.32↑#15553↓0.17↓22.6 years↑
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature."
Thriving Grubs80%
$0.05↓#26004↓0.22↓9.9 years↑
"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."
Thriving Rats80%
$0.08↓#24249↓0.29↓9.9 years↑
"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."
Thriving Ibex80%
$0.05↓#27283↓0.27↓9.9 years↑
"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."
Thriving Turtle80%
$0.11↓#20385↓0.20↓9.9 years↑
"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."
Thriving Rhino80%
$0.09↓#26540↓0.31↓9.9 years↑
"Whenever this creature attacks, you may pay 
. If you do, put a +1/+1 counter on it."
Alesha, Who Laughs at Fate80%
$1.58↑#1779↑0.30↓1.8 years
"Whenever this card attacks, put a +1/+1 counter on it."
+1 more matching line
Descendant of Storms80%
$0.20↑#17904↓0.15↓1.4 years
"Whenever this creature attacks, you may pay 
. If you do, it endures 1."
Kor Scythemaster80%
$0.07↓#28862↓0.00↓10.6 years↑
"This creature has first strike as long as it's attacking."
Gau, Feral Youth79%
$0.23↑#8119↑0.22↓1.2 years
"Whenever this card attacks, put a +1/+1 counter on it."
Air Nomad Student79%
$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."
Ash, Party Crasher79%
$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."
Herald of War78%
$2.53↑#3161↑0.30↓14.3 years↑
"Whenever this creature attacks, put a +1/+1 counter on it."