Mtenda Lion {G}
Creature — Cat
Whenever this creature attacks, defending player may pay {U}. If that player does, prevent all combat damage that would be dealt by this creature this turn.
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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.
Xantid Swarm 84%
$3.88#13727
"Whenever this creature attacks, defending player can't cast spells this turn."
Passenger Ferry 84%
$0.08#18099
"Whenever this Vehicle attacks, you may pay {U}. When you do, another target attacking creature can't be blocked this turn."
Shrouded Serpent 83%
$0.29#27622
"Whenever this creature attacks, defending player may pay {4}. If that player doesn't, this creature can't be blocked this turn."
Dauthi Mindripper 81%
$0.26#22949
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards."
Mindstab Thrull 81%
#26488
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards."
Admiral's Order 81%
$0.32#11284
"If you attacked this turn, you may pay {U} rather than pay this spell's mana cost."
Suppressor Skyguard 80%
$12.54#9077
"Whenever a player attacks you, if that player has another opponent who isn't being attacked, prevent all combat damage that would be dealt to you this combat."