Paired Tactician 

Creature — Human Warrior
Whenever this creature and at least one other Warrior attack, put a +1/+1 counter on this creature.
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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.
Makeshift Battalion 87%
$0.13#22067
"Whenever this creature and at least two other creatures attack, put a +1/+1 counter on this creature."
Fangren Firstborn 82%
$2.46#15366
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature."
Sickle Dancer 82%
$0.04#30874
"Whenever this creature attacks, if your team controls another Warrior, this creature gets +1/+1 until end of turn."