Vicious Rivalry 
Sorcery
$0.28 #9686 0.00 0.4 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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Cards similar to Vicious Rivalry 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.
Meltdown96%
$0.37↑#7561↑0.43↑27.9 years↑
"Destroy each artifact with mana value X or less."
Forced March93%
$0.97↑#24066↓0.29↑26.9 years↑
"Destroy all creatures with mana value X or less."
Ritual of Soot93%
$0.27↓#16638↓0.36↑7.9 years↑
"Destroy all creatures with mana value 3 or less."
Granulate93%
$0.27↓#29546↓0.36↑22.3 years↑
"Destroy each nonland artifact with mana value 4 or less."
Culling Sun90%
$0.34↑#27627↓0.19↑20.6 years↑
"Destroy each creature with mana value 3 or less."
Path of Peril90%
$0.30↑#18582↓0.20↑4.8 years↑
"Destroy all creatures [with mana value 2 or less]."
Pernicious Deed90%
$3.33↑#5675↑0.42↑25.3 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."
Powder Keg88%
$66.86↑#24487↓0.13↑27.2 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."
Hammer Mage88%
$0.26↓#22843↓0.39↑26.9 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 Corrosion87%
$3.65↑#89250.62↑15.6 years↑
"Destroy all artifacts."
Toxic Deluge86%
$4.49↑#67↑0.87↑12.8 years↑
"As an additional cost to cast this spell, pay X life."
Day of Black Sun84%
$0.99↑#6488↑0.000.8 years
"Each creature with mana value X or less loses all abilities until end of turn. Destroy those creatures."
Fumarole83%
$0.24↓#30340↓0.43↑31.3 years↑
"As an additional cost to cast this spell, pay 3 life."
Tainted Treats82%
$0.26↓#13758↓0.000.5 years
"Destroy target artifact or creature. If its mana value was 4 or less, create a Food token."
Brotherhood's End82%
$1.16↑#6247↑0.37↑3.8 years↑
"• Destroy all artifacts with mana value 3 or less."
Austere Command80%
$0.34↑#167↑0.70↑18.9 years↑
"• Destroy all creatures with mana value 3 or less."
Duneblast80%
$0.17↓#79740.53↑11.9 years↑
"Choose up to one creature. Destroy the rest."
Crime // Punishment80%
$0.24↓#23791↓0.0020.3 years↑
"Destroy each artifact, creature, and enchantment with mana value X."
Purify80%
$0.41↑#25341↓0.50↑27.6 years↑
"Destroy all artifacts and enchantments."
Pest Control80%
$4.93↑#15737↓0.56↑2.4 years↑
"Destroy all nonland permanents with mana value 1 or less."