Vicious Rivalry 


Sorcery
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 that do something similar 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.
Toxic Deluge 100%
$3.21#67
"As an additional cost to cast this spell, pay X life."
+1 more matching line
Liesa, Shroud of Dusk 90%
$0.98#5565
"Rather than pay {2} for each previous time you've cast this spell from the command zone this game, pay 2 life that many times."
Voracious Tome-Skimmer 87%
$0.27#7946
"Whenever you cast a spell during an opponent's turn, you may pay 1 life. If you do, draw a card."
Protective Sphere 84%
$0.17#25348
"{1}, Pay 1 life: Prevent all damage that would be dealt to you this turn by a source of your choice that shares a color with the mana spent on this activation cost."
Defiler of Vigor 83%
$3.07#1569
"As an additional cost to cast green permanent spells, you may pay 2 life. Those spells cost {G} less to cast if you paid life this way. This effect reduces only the amount of green mana you pay."
Defiler of Dreams 83%
$0.40#4653
"As an additional cost to cast blue permanent spells, you may pay 2 life. Those spells cost {U} less to cast if you paid life this way. This effect reduces only the amount of blue mana you pay."
Defiler of Flesh 83%
$0.46#5469
"As an additional cost to cast black permanent spells, you may pay 2 life. Those spells cost {B} less to cast if you paid life this way. This effect reduces only the amount of black mana you pay."