Lim-Dûl's Paladin {2}{B}{R}
Creature — Human Knight
Trample
At the beginning of your upkeep, you may discard a card. If you don't, sacrifice this creature and draw a card.
Whenever this creature becomes blocked, it gets +6/+3 until end of turn.
Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 4 life.
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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.
Keeper of Tresserhorn 100%
$0.64#31165
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 2 life."
Trained Cheetah 96%
$10.13#31436
"Whenever this creature becomes blocked, it gets +1/+1 until end of turn."
Norwood Warrior 96%
$0.55#29819
"Whenever this creature becomes blocked, it gets +1/+1 until end of turn."
Deeproot Warrior 96%
$0.07#27713
"Whenever this creature becomes blocked, it gets +1/+1 until end of turn."
Guiltfeeder 95%
$1.44#6718
"Whenever this creature attacks and isn't blocked, defending player loses 1 life for each card in their graveyard."
Deepwood Wolverine 90%
$0.22#30055
"Whenever this creature becomes blocked, it gets +2/+0 until end of turn."
Delta Bloodflies 90%
$0.19#16152
"Whenever this creature attacks, if you control a creature with a counter on it, each opponent loses 1 life."
Snorting Gahr 89%
$0.16#31138
"Whenever this creature becomes blocked, it gets +2/+2 until end of turn."
Ichorclaw Myr 89%
$0.87#4704
"Whenever this creature becomes blocked, it gets +2/+2 until end of turn."
Razorclaw Bear 89%
$30.49#21203
"Whenever this creature becomes blocked, it gets +2/+2 until end of turn."
Slashing Tiger 89%
#31079
"Whenever this creature becomes blocked, it gets +2/+2 until end of turn."
Ravenloft Adventurer 89%
$0.36#5509
"Whenever this creature attacks, if you've completed a dungeon, defending player loses 1 life for each card they own in exile with a hit counter on it."
Gutwrencher Oni 89%
$0.21#24833
"At the beginning of your upkeep, discard a card if you don't control an Ogre."
+1 more matching line
Blood Reckoning 89%
$0.21#12059
"Whenever a creature attacks you or a planeswalker you control, that creature's controller loses 1 life."
Marchesa's Decree 89%
$3.64#7127
"Whenever a creature attacks you or a planeswalker you control, that creature's controller loses 1 life."
Calculating Lich 88%
$0.73#12897
"Whenever a creature attacks one of your opponents, that player loses 1 life."
Thornbow Archer 87%
$0.08#14509
"Whenever this creature attacks, each opponent who doesn't control an Elf loses 1 life."