Psychomancer 
Artifact Creature — Necron Wizard
$1.46 #8896 0.20 3.9 years
Flying
Harbinger of Despair — Whenever this creature or another nontoken artifact you control is put into a graveyard from the battlefield or is put into exile from the battlefield, target opponent loses 1 life and you gain 1 life.
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Cards similar to Psychomancer 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.
Al Bhed Salvagers90%
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"Whenever this creature or another creature or artifact you control dies, target opponent loses 1 life and you gain 1 life."
Falkenrath Noble86%
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"Whenever this creature or another creature dies, target player loses 1 life and you gain 1 life."
Blood Artist86%
$2.79↑#139↑0.56↑14.3 years↑
"Whenever this creature or another creature dies, target player loses 1 life and you gain 1 life."
Vengeful Bloodwitch86%
$0.30↓#1785↑0.271.8 years↓
"Whenever this creature or another creature you control dies, target opponent loses 1 life and you gain 1 life."
Susurian Voidborn84%
$0.31↓#6613↑0.161.1 years↓
"Whenever this creature or another creature or artifact you control dies, target opponent loses 1 life and you gain 1 life."
Zulaport Cutthroat82%
$1.05↓#234↑0.51↑10.9 years↑
"Whenever this creature or another creature you control dies, each opponent loses 1 life and you gain 1 life."
Vraan, Executioner Thane80%
$0.35↓#4205↑0.203.6 years
"Whenever one or more other creatures you control die, each opponent loses 2 life and you gain 2 life. This ability triggers only once each turn."
Blight Keeper80%
$0.22↓#16780↓0.56↑8.9 years↑
"Flying"
Cloudsculpt Technician79%
$0.04↓#24549↓0.141.1 years↓
"Flying"
Bastion of Remembrance78%
$0.26↓#333↑0.35↑6.4 years↑
"Whenever a creature you control dies, each opponent loses 1 life and you gain 1 life."
Vein Ripper76%
$6.15↑#2683↑0.55↑2.6 years↓
"Whenever a creature dies, target opponent loses 2 life and you gain 2 life."
Vindictive Vampire76%
$0.19↓#4387↑0.247.6 years↑
"Whenever another creature you control dies, this creature deals 1 damage to each opponent and you gain 1 life."
Plasmancer76%
$0.32↓#13872↓0.35↑3.9 years
"Flying"
Fell Beast of Mordor76%
$0.90↓#97790.06↓2.8 years↓
"Flying"
Cruel Celebrant75%
$0.97↓#950↑0.32↑7.3 years↑
"Whenever this creature or another creature or planeswalker you control dies, each opponent loses 1 life and you gain 1 life."
High Fae Negotiator75%
$0.18↓#18372↓0.243.0 years
"Flying"
Venerated Stormsinger74%
$0.32↓#5508↑0.171.4 years↓
"Whenever this creature or another creature you control dies, each opponent loses 1 life and you gain 1 life."
Disciple of the Vault74%
$0.90↓#2441↑0.2922.9 years↑
"Whenever an artifact is put into a graveyard from the battlefield, you may have target opponent lose 1 life."
Funeral Room // Awakening Hall74%
$5.58↑#2069↑0.261.9 years↓
"Whenever a creature you control dies, each opponent loses 1 life and you gain 1 life."
Shard of the Void Dragon74%
$2.76↑#97380.93↑3.9 years
"Whenever an artifact is put into a graveyard from the battlefield or is put into exile from the battlefield, put two +1/+1 counters on this creature."