Fog 
Instant
$0.21 #669 0.47 33.1 years
Prevent all combat damage that would be dealt this turn.
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Cards similar to Fog 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.
Darkness100%
$11.97↑#1876↓0.4232.3 years
"Prevent all combat damage that would be dealt this turn."
Root Snare100%
$0.17↓#11683↓0.14↓8.1 years↓
"Prevent all combat damage that would be dealt this turn."
Holy Day100%
$0.27↑#5933↓0.06↓32.3 years
"Prevent all combat damage that would be dealt this turn."
Ethereal Haze98%
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"Prevent all damage that would be dealt by creatures this turn."
Angelsong98%
$0.34↑#8627↓0.28↓17.9 years↓
"Prevent all combat damage that would be dealt this turn."
Lull98%
$0.16↓#7313↓0.00↓27.9 years↓
"Prevent all combat damage that would be dealt this turn."
Constant Mists98%
$19.38↑#2345↓1.34↑28.5 years↓
"Prevent all combat damage that would be dealt this turn."
Haze of Pollen98%
$0.25↑#13225↓0.62↑9.4 years↓
"Prevent all combat damage that would be dealt this turn."
Moment's Peace97%
$4.70↑#5785↓0.25↓24.9 years↓
"Prevent all combat damage that would be dealt this turn."
Pause for Reflection96%
$0.13↓#13698↓0.407.9 years↓
"Prevent all combat damage that would be dealt this turn."
Tangle95%
$4.19↑#6252↓0.4225.9 years↓
"Prevent all combat damage that would be dealt this turn."
Angus Mackenzie91%
$214.04↑#18696↓0.64↑32.3 years
"
, 
: Prevent all combat damage that would be dealt this turn. Activate only before the combat damage step."
, : Prevent all combat damage that would be dealt this turn. Activate only before the combat damage step."
Clinging Mists90%
$0.24↑#18954↓0.07↓14.6 years↓
"Prevent all combat damage that would be dealt this turn."
Thwart the Enemy90%
$0.15↓#14375↓0.10↓6.4 years↓
"Prevent all damage that would be dealt this turn by creatures your opponents control."
Kami of False Hope90%
$0.60↑#5411↓0.24↓21.6 years↓
"Sacrifice this creature: Prevent all combat damage that would be dealt this turn."
Spore Frog90%
$0.40↑#1132↓0.80↑26.3 years↓
"Sacrifice this creature: Prevent all combat damage that would be dealt this turn."
Terrifying Presence90%
$0.24↑#11824↓0.26↓14.3 years↓
"Prevent all combat damage that would be dealt by creatures other than target creature this turn."
Jaheira's Respite88%
$0.73↑#5014↓0.22↓4.2 years↓
"Prevent all combat damage that would be dealt this turn."
Spore Flower86%
$0.38↑#14967↓0.75↑31.8 years↓
"Remove three spore counters from this creature: Prevent all combat damage that would be dealt this turn."
Haze Frog86%
$0.37↑#9855↓0.4316.4 years↓
"When this creature enters, prevent all combat damage that other creatures would deal this turn."