Soul Spike 
Instant
$16.96 #26001 0.50 20.1 years
You may exile two black cards from your hand rather than pay this spell's mana cost.
Soul Spike deals 4 damage to any target and you gain 4 life.
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Cards similar to Soul Spike 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.
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Lightning Helix97%
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"this card deals 3 damage to any target and you gain 3 life."
Essence Drain97%
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"this card deals 3 damage to any target and you gain 3 life."
Dark Nourishment97%
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"this card deals 3 damage to any target. You gain 3 life."
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"this card deals 4 damage to any target and you gain 4 life."
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"this card deals 3 damage to any target. You gain 3 life."
Smiting Helix92%
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"this card deals 3 damage to any target and you gain 3 life."
March of Wretched Sorrow92%
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"As an additional cost to cast this spell, you may exile any number of black cards from your hand. This spell costs 
less to cast for each card exiled this way."
less to cast for each card exiled this way."+1 more matching line
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"this card deals 2 damage to any target and you gain 2 life."
Consume Spirit91%
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"this card deals X damage to any target and you gain X life."
+1 more matching line
Integrity // Intervention90%
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"Intervention deals 3 damage to any target and you gain 3 life."
Fear of Lost Teeth90%
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"When this creature dies, it deals 1 damage to any target and you gain 1 life."
Harsh Sustenance88%
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"this card deals X damage to any target and you gain X life, where X is the number of creatures you control."
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Sonic Shrieker85%
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Sickening Shoal84%
$10.05↓#19381↑0.4721.6 years↑
"You may exile a black card with mana value X from your hand rather than pay this spell's mana cost."