Soul Spike 
Instant
$17.57 #25844 0.06 20.2 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.
Vampiric Feast96%
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"this card deals 4 damage to any target and you gain 4 life."
Warleader's Helix96%
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"this card deals 4 damage to any target and you gain 4 life."
Void Helix96%
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"this card deals 5 damage to any target and you gain 5 life."
Lightning Helix96%
$0.24↓#3787↑0.0821.0 years
"this card deals 3 damage to any target and you gain 3 life."
Essence Drain96%
$0.07↓#263920.31↑22.7 years↑
"this card deals 3 damage to any target and you gain 3 life."
Agonizing Syphon96%
$0.18↓#19407↑0.007.3 years↓
"this card deals 3 damage to any target and you gain 3 life."
Dark Nourishment96%
$0.10↓#281790.059.1 years↓
"this card deals 3 damage to any target. You gain 3 life."
Death Grasp96%
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"this card deals X damage to any target. You gain X life."
Covenant of Blood96%
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"this card deals 4 damage to any target and you gain 4 life."
Morbid Hunger94%
$0.09↓#31135↓0.0625.1 years↑
"this card deals 3 damage to any target. You gain 3 life."
Smiting Helix92%
$0.09↓#305610.007.4 years↓
"this card deals 3 damage to any target and you gain 3 life."
Sacred Fire92%
$0.24↓#14164↑0.29↑5.1 years↓
"this card deals 2 damage to any target and you gain 2 life."
Integrity // Intervention91%
$0.12↓#19782↑0.008.0 years↓
"this card deals 3 damage to any target and you gain 3 life."
Consume Spirit90%
$0.09↓#13382↑0.1223.0 years↑
"this card deals X damage to any target and you gain X life."
+1 more matching line
Warrior's Blades90%
$0.18↓#269740.050.0 years↓
"When this Equipment enters, it deals 3 damage to any target and you gain 3 life."
March of Wretched Sorrow90%
$0.34↓#9589↑0.22↑4.7 years↓
"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
Fear of Lost Teeth89%
$0.28↓#10811↑0.002.1 years↓
"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."
Sickening Shoal86%
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"You may exile a black card with mana value X from your hand rather than pay this spell's mana cost."
Unmask86%
$6.25↓#18070↑0.52↑27.0 years↑
"You may exile a black card from your hand rather than pay this spell's mana cost."