Taste of Blood 
Sorcery
Taste of Blood deals 1 damage to target player or planeswalker and you gain 1 life.
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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.
Sorin's Vengeance 93%
$1.13#12558
"this card deals 10 damage to target player or planeswalker and you gain 10 life."
Vampiric Touch 85%
$0.20#29503
"this card deals 2 damage to target opponent or planeswalker and you gain 2 life."
Chandra, Fire of Kaladesh // Chandra, Roaring Flame 84%
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"+1: this card deals 2 damage to target player or planeswalker."
Touch of Death 83%
$0.10#28054
"this card deals 1 damage to target player or planeswalker. You gain 1 life."
Consuming Corruption 82%
$0.30#2402
"this card deals X damage to target creature or planeswalker and you gain X life, where X is the number of Swamps you control."
March of Wretched Sorrow 82%
$0.34#9150
"this card deals X damage to target creature or planeswalker and you gain X life."
Sorin, Vengeful Bloodlord 81%
$1.37#5183
"+2: this card deals 1 damage to target player or planeswalker."
Lantern Flare 81%
$0.14#20115
"this card deals X damage to target creature or planeswalker and you gain X life. [X is the number of creatures you control.]"