Leader's Talent {1}{W}
Enchantment — Class
(Gain the next level as a sorcery to add its ability.)
Whenever you attack, put a +1/+1 counter on target attacking creature.
{2}{W}: Level 2
Whenever a creature you control leaves the battlefield, if it had a counter on it, you gain 2 life.
{3}{W}: Level 3
Whenever you cast a spell, put a +1/+1 counter on each creature you control.
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Cards that do something similar 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.
Ranger Class 100%
$0.43#7487
"Whenever you attack, put a +1/+1 counter on target attacking creature."
Surgical Suite // Hospital Room 100%
$0.23#8463
"Whenever you attack, put a +1/+1 counter on target attacking creature."
Araña, Heart of the Spider 100%
$0.60#6203
"Whenever you attack, put a +1/+1 counter on target attacking creature."
Nita, Forum Conciliator 94%
$0.15#20696
"Whenever you cast a spell you don't own, put a +1/+1 counter on each creature you control."
Lunarch Veteran // Luminous Phantom 90%
$0.30#3345
"Whenever another creature you control leaves the battlefield, you gain 1 life."
+1 more matching line
Hamza, Guardian of Arashin 82%
$0.27#3343
"This spell costs {1} less to cast for each creature you control with a +1/+1 counter on it."