Spore Cloud 
Instant
$0.17 #17236 1.00 31.8 years
Tap all blocking creatures. Prevent all combat damage that would be dealt this turn. Each attacking creature and each blocking creature doesn't untap during its controller's next untap step.
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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.
Tangle89%
$4.19↑#6252↑0.42↓25.9 years↓
"Each attacking creature doesn't untap during its controller's next untap step."
Feint88%
$0.45↑#28797↓0.28↓32.3 years
"Tap all creatures blocking target attacking creature. Prevent all combat damage that would be dealt this turn by that creature and each creature blocking it."
Clinging Mists86%
$0.24↑#189540.07↓14.6 years↓
"If you have 5 or less life, tap all attacking creatures. Those creatures don't untap during their controller's next untap step."
Respite84%
$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."
Harmless Assault84%
$0.12↓#25098↓0.37↓16.4 years↓
"Prevent all combat damage that would be dealt this turn by attacking creatures."
Revealing Wind83%
$0.05↓#24454↓0.32↓11.4 years↓
"Prevent all combat damage that would be dealt this turn. You may look at each face-down creature that's attacking or blocking."
Telekinesis80%
$32.89↑#28933↓0.81↓32.3 years
"Tap target creature. Prevent all combat damage that would be dealt by that creature this turn. It doesn't untap during its controller's next two untap steps."
Darkness80%
$11.97↑#1876↑0.42↓32.3 years
"Prevent all combat damage that would be dealt this turn."
Root Snare80%
$0.17#11683↑0.14↓8.1 years↓
"Prevent all combat damage that would be dealt this turn."
Fog80%
$0.21↑#669↑0.47↓33.1 years↑
"Prevent all combat damage that would be dealt this turn."
Holy Day80%
$0.27↑#5933↑0.06↓32.3 years
"Prevent all combat damage that would be dealt this turn."
Ethereal Haze79%
$0.98↑#8570↑0.56↓21.9 years↓
"Prevent all damage that would be dealt by creatures this turn."
Joven's Ferrets78%
$0.34↑#27968↓0.50↓30.9 years
"At end of combat, tap all creatures that blocked this creature this turn. They don't untap during their controller's next untap step."
Angelsong76%
$0.34↑#8627↑0.28↓17.9 years↓
"Prevent all combat damage that would be dealt this turn."
Lull76%
$0.16↓#7313↑0.00↓27.9 years↓
"Prevent all combat damage that would be dealt this turn."
Constant Mists75%
$19.38↑#2345↑1.34↑28.5 years↓
"Prevent all combat damage that would be dealt this turn."
Haze of Pollen75%
$0.25↑#13225↑0.62↓9.4 years↓
"Prevent all combat damage that would be dealt this turn."
Snag74%
$0.27↑#181030.26↓26.3 years↓
"Prevent all combat damage that would be dealt by unblocked creatures this turn."
Jaheira's Respite74%
$0.73↑#5014↑0.22↓4.2 years↓
"Prevent all combat damage that would be dealt this turn."
Moment's Peace74%
$4.70↑#5785↑0.25↓24.9 years↓
"Prevent all combat damage that would be dealt this turn."