Streetwise Negotiator 

Creature — Cat Citizen
Backup 1 (When this creature enters, put a +1/+1 counter on target creature. If that's another creature, it gains the following ability until end of turn.)
This creature assigns combat damage equal to its toughness rather than its power.
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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.
Doran, the Siege Tower 90%
$9.34#5299
"Each creature assigns combat damage equal to its toughness rather than its power."
Bark of Doran 84%
$0.21#15821
"As long as equipped creature's toughness is greater than its power, it assigns combat damage equal to its toughness rather than its power."
Jagged Poppet 84%
$0.31#21845
"Whenever this creature deals combat damage to a player, if you have no cards in hand, that player discards cards equal to the damage."
Hydra Omnivore 82%
$0.54#3943
"Whenever this creature deals combat damage to an opponent, it deals that much damage to each other opponent."
Grenzo's Ruffians 82%
$0.21#20720
"Whenever this creature deals combat damage to an opponent, it deals that much damage to each other opponent."
Permeating Mass 82%
$0.30#17879
"Whenever this creature deals combat damage to a creature, that creature becomes a copy of this creature."
Lone Wolf 81%
$0.13#21016
"You may have this creature assign its combat damage as though it weren't blocked."
Rhox 81%
$0.55#22086
"You may have this creature assign its combat damage as though it weren't blocked."
Thorn Elemental 81%
$0.21#18440
"You may have this creature assign its combat damage as though it weren't blocked."
Spinebiter 81%
$0.37#15812
"You may have this creature assign its combat damage as though it weren't blocked."
Tornado Elemental 81%
$0.36#18023
"You may have this creature assign its combat damage as though it weren't blocked."
Pride of Lions 81%
$0.29#24517
"You may have this creature assign its combat damage as though it weren't blocked."
Wolf Pack 81%
#27694
"You may have this creature assign its combat damage as though it weren't blocked."
Deathcoil Wurm 81%
#20495
"You may have this creature assign its combat damage as though it weren't blocked."
Imperious Mindbreaker 81%
$0.37#14266
"As long as this card is paired with another creature, each of those creatures has "Whenever this creature attacks, each opponent mills cards equal to its toughness.""
Belligerent Brontodon 81%
$0.21#19536
"Each creature you control assigns combat damage equal to its toughness rather than its power."
Huatli, the Sun's Heart 81%
$0.34#6433
"Each creature you control assigns combat damage equal to its toughness rather than its power."
High Alert 81%
$0.42#5590
"Each creature you control assigns combat damage equal to its toughness rather than its power."