Vicious Rivalry 
Sorcery
$0.30 #8940 0.36 0.5 years
As an additional cost to cast this spell, pay X life.
Destroy all artifacts and creatures with mana value X or less.
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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.
Meltdown95%
$0.34↑#75910.47↑28.0 years↑
"Destroy each artifact with mana value X or less."
Forced March92%
$1.22↑#24481↓0.4327.0 years↑
"Destroy all creatures with mana value X or less."
Ritual of Soot92%
$0.24↓#16858↓0.24↓8.0 years↑
"Destroy all creatures with mana value 3 or less."
Granulate92%
$0.21↓#29959↓0.10↓22.4 years↑
"Destroy each nonland artifact with mana value 4 or less."
Toxic Deluge90%
$5.07↑#66↑0.81↑13.0 years↑
"As an additional cost to cast this spell, pay X life."
Pernicious Deed88%
$2.65↑#5787↑0.3325.4 years↑
"
, Sacrifice this enchantment: Destroy each artifact, creature, and enchantment with mana value X or less."
, Sacrifice this enchantment: Destroy each artifact, creature, and enchantment with mana value X or less."
Culling Sun88%
$0.35↑#27943↓0.2820.7 years↑
"Destroy each creature with mana value 3 or less."
Fumarole87%
$0.22↓#30656↓0.25↓31.4 years↑
"As an additional cost to cast this spell, pay 3 life."
Powder Keg86%
$69.89↑#24722↓0.4427.4 years↑
"
, Sacrifice this artifact: Destroy each artifact and creature with mana value equal to the number of fuse counters on this artifact."
, Sacrifice this artifact: Destroy each artifact and creature with mana value equal to the number of fuse counters on this artifact."
Path of Peril86%
$0.33↑#18922↓0.314.9 years↑
"Destroy all creatures [with mana value 2 or less]."
Hammer Mage86%
$0.25↓#23144↓0.3527.0 years↑
"
, , Discard a card: Destroy all artifacts with mana value X or less."
, , Discard a card: Destroy all artifacts with mana value X or less."
Creeping Corrosion84%
$2.91↑#91160.69↑15.7 years↑
"Destroy all artifacts."
Bond of Agony84%
$1.60↑#15250↓0.3020.5 years↑
"As an additional cost to cast this spell, pay X life."
Fire Covenant84%
$0.34↑#2723↑0.18↓31.4 years↑
"As an additional cost to cast this spell, pay X life."
Bitter Triumph83%
$0.32↑#828↑0.21↓2.9 years↑
"As an additional cost to cast this spell, discard a card or pay 3 life."
Day of Black Sun82%
$1.30↑#6242↑0.350.9 years
"Each creature with mana value X or less loses all abilities until end of turn. Destroy those creatures."
Fix What's Broken82%
$0.32↑#99780.260.5 years
"As an additional cost to cast this spell, pay X life."
+1 more matching line
Brotherhood's End80%
$1.06↑#6213↑0.76↑3.9 years↑
"• Destroy all artifacts with mana value 3 or less."
Tainted Treats80%
$0.23↓#13231↓0.380.6 years
"Destroy target artifact or creature. If its mana value was 4 or less, create a Food token."
Hatred80%
$64.90↑#77820.14↓28.3 years↑
"As an additional cost to cast this spell, pay X life."