Harmless Assault 
Instant
$0.12 #25098 0.37 16.4 years
Prevent all combat damage that would be dealt this turn by attacking creatures.
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Cards similar to Harmless Assault 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.
Snag93%
$0.27↑#18103↑0.26↓26.3 years↑
"Prevent all combat damage that would be dealt by unblocked creatures this turn."
Thwart the Enemy92%
$0.15↑#14375↑0.10↓6.4 years↓
"Prevent all damage that would be dealt this turn by creatures your opponents control."
Terrifying Presence92%
$0.24↑#11824↑0.26↓14.3 years↓
"Prevent all combat damage that would be dealt by creatures other than target creature this turn."
Obscuring Haze90%
$4.85↑#1503↑0.84↑6.4 years↓
"Prevent all damage that would be dealt this turn by creatures your opponents control."
Respite90%
$0.37↑#8718↑0.24↓28.9 years↑
"Prevent all combat damage that would be dealt this turn. You gain 1 life for each attacking creature."
Heavy Fog89%
$27.75↑#245000.00↓27.3 years↑
"Prevent all damage that would be dealt to you this turn by attacking creatures."
Deep Wood89%
$0.23↑#246580.22↓29.3 years↑
"Prevent all damage that would be dealt to you this turn by attacking creatures."
Tangle88%
$4.19↑#6252↑0.4225.9 years↑
"Prevent all combat damage that would be dealt this turn."
Al-abara's Carpet86%
$41.61↑#273190.07↓32.3 years↑
"
, 
: Prevent all damage that would be dealt to you this turn by attacking creatures without flying."
, : Prevent all damage that would be dealt to you this turn by attacking creatures without flying."
Hindervines86%
$0.15↑#15666↑0.22↓13.6 years↓
"Prevent all combat damage that would be dealt this turn by creatures with no +1/+1 counters on them."
Vine Snare86%
$0.16↑#278240.00↓11.1 years↓
"Prevent all combat damage that would be dealt this turn by creatures with power 4 or less."
Serene Sunset86%
$0.22↑#213040.3124.3 years↑
"Prevent all combat damage X target creatures would deal this turn."
Darkness85%
$11.97↑#1876↑0.4232.3 years↑
"Prevent all combat damage that would be dealt this turn."
Fog85%
$0.21↑#669↑0.4733.1 years↑
"Prevent all combat damage that would be dealt this turn."
Holy Day85%
$0.27↑#5933↑0.06↓32.3 years↑
"Prevent all combat damage that would be dealt this turn."
Root Snare85%
$0.17↑#11683↑0.14↓8.1 years↓
"Prevent all combat damage that would be dealt this turn."
Encircling Fissure85%
$0.17↑#207580.3510.9 years↓
"Prevent all combat damage that would be dealt this turn by creatures target opponent controls."
Tanglesap85%
$0.07↓#214740.00↓16.9 years
"Prevent all combat damage that would be dealt this turn by creatures without trample."
Winds of Qal Sisma84%
$0.33↑#9810↑0.26↓11.6 years↓
"Prevent all combat damage that would be dealt this turn."
Hunter's Ambush84%
$0.13↑#201590.4012.1 years↓
"Prevent all combat damage that would be dealt by nongreen creatures this turn."