Serpent Warrior 
Creature — Snake Warrior
$0.07 #31718 0.06 29.5 years
When this creature enters, you lose 3 life.
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Cards similar to Serpent Warrior 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 Abomination100%
$0.08↑#297900.054.1 years↓
"When this creature enters, you lose 2 life."
Necrogen Scudder99%
$0.04↓#305420.0016.1 years↓
"When this creature enters, you lose 3 life."
Cao Ren, Wei Commander99%
$113.30↑#270010.17↑27.5 years↓
"When this card enters, you lose 3 life."
Dread Reaper99%
$0.64↑#314860.0029.5 years
"When this creature enters, you lose 5 life."
Vampiric Spirit99%
$0.28↑#313380.0628.3 years↓
"When this creature enters, you lose 4 life."
Foul Imp99%
$0.08↑#300200.0028.6 years
"When this creature enters, you lose 2 life."
Nightdrinker Moroii96%
$0.07#282260.002.7 years↓
"When this creature enters, you lose 3 life."
Benthic Djinn93%
$0.65↑#300330.0030.0 years
"At the beginning of your upkeep, you lose 2 life."
Cloistered Youth // Unholy Fiend92%
$0.07#313990.0015.1 years↓
"At the beginning of your end step, you lose 1 life."
Eviscerator90%
$0.37↑#309330.0027.7 years↓
"When this creature enters, you lose 5 life."
Moroii88%
$0.04↓#296800.0521.0 years↓
"At the beginning of your upkeep, you lose 1 life."
Dark Favor86%
$0.04↓#21631↑0.1215.3 years↓
"When this Aura enters, you lose 1 life."
Lava Hounds86%
$0.10↑#303420.0029.4 years
"When this creature enters, it deals 4 damage to you."
Fretwork Colony86%
$0.19↑#23031↑0.0010.1 years↓
"At the beginning of your upkeep, put a +1/+1 counter on this creature and you lose 1 life."
Sangrophage86%
$0.07#300560.24↑20.0 years↓
"At the beginning of your upkeep, tap this creature unless you pay 2 life."
Carnophage86%
$0.70↑#267930.0028.3 years↓
"At the beginning of your upkeep, tap this creature unless you pay 1 life."
Gallowbraid83%
$1.09↑#276890.0029.4 years
"Cumulative upkeep—Pay 1 life."
Morinfen82%
$0.71↑#278590.0029.4 years
"Cumulative upkeep—Pay 1 life."
Grinning Demon81%
$5.81↑#20556↑0.0724.0 years↓
"At the beginning of your upkeep, you lose 2 life."
Dross Harvester79%
$0.33↑#15304↑0.22↑23.0 years↓
"At the beginning of your end step, you lose 4 life."