Harmless Assault 


Instant
Prevent all combat damage that would be dealt this turn by attacking creatures.
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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.
Dolmen Gate 90%
$31.59#1338
"Prevent all combat damage that would be dealt to attacking creatures you control."
Snag 88%
$0.28#17922
"Prevent all combat damage that would be dealt by unblocked creatures this turn."
Deep Wood 87%
$0.47#24372
"Prevent all damage that would be dealt to you this turn by attacking creatures."
Heavy Fog 87%
#24306
"Prevent all damage that would be dealt to you this turn by attacking creatures."
Druid's Deliverance 85%
$0.33#4041
"Prevent all combat damage that would be dealt to you this turn. Populate."
Commencement of Festivities 85%
$0.18#14574
"Prevent all combat damage that would be dealt to players this turn."
Defend the Hearth 85%
$0.07#14602
"Prevent all combat damage that would be dealt to players this turn."
Hunter's Ambush 84%
$0.10#20030
"Prevent all combat damage that would be dealt by nongreen creatures this turn."
Inspire Awe 84%
$0.12#20715
"Prevent all combat damage that would be dealt this turn except combat damage that would be dealt by enchanted creatures and enchantment creatures. Scry 2."
Inkshield 83%
$4.21#807
"Prevent all combat damage that would be dealt to you this turn. For each 1 damage prevented this way, create a 2/1 white and black Inkling creature token with flying."
Galadhrim Ambush 83%
$5.00#2249
"Prevent all combat damage that would be dealt this turn by non-Elf creatures."