Psychomancer 
Artifact Creature — Necron Wizard
$1.22 #9148 0.28 4.0 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%
$0.22↓#5600↑0.63↑1.4 years↓
"Whenever this creature or another creature or artifact you control dies, target opponent loses 1 life and you gain 1 life."
Falkenrath Noble86%
$0.15↓#2051↑0.2315.1 years↑
"Whenever this creature or another creature dies, target player loses 1 life and you gain 1 life."
+1 more matching line
Blood Artist86%
$2.93↑#144↑0.69↑14.5 years↑
"Whenever this creature or another creature dies, target player loses 1 life and you gain 1 life."
Vengeful Bloodwitch84%
$0.26↓#1725↑0.201.9 years↓
"Whenever this creature or another creature you control dies, target opponent loses 1 life and you gain 1 life."
Susurian Voidborn84%
$0.30↓#6406↑0.06↓1.2 years↓
"Whenever this creature or another creature or artifact you control dies, target opponent loses 1 life and you gain 1 life."
Vraan, Executioner Thane80%
$0.36↓#4325↑0.05↓3.7 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."
Zulaport Cutthroat80%
$1.24↑#236↑0.49↑11.0 years↑
"Whenever this creature or another creature you control dies, each opponent loses 1 life and you gain 1 life."
Blight Keeper80%
$0.25↓#17066↓0.00↓9.1 years↑
"Flying"
Bastion of Remembrance78%
$0.27↓#331↑0.346.5 years↑
"Whenever a creature you control dies, each opponent loses 1 life and you gain 1 life."
Vein Ripper76%
$6.09↑#2774↑0.59↑2.7 years↓
"Whenever a creature dies, target opponent loses 2 life and you gain 2 life."
Vindictive Vampire76%
$0.23↓#4544↑0.257.7 years↑
"Whenever another creature you control dies, this creature deals 1 damage to each opponent and you gain 1 life."
Fell Beast of Mordor76%
$1.22#98140.203.0 years↓
"Flying"
Cruel Celebrant75%
$0.81↓#978↑0.357.5 years↑
"Whenever this creature or another creature or planeswalker you control dies, each opponent loses 1 life and you gain 1 life."
Venerated Stormsinger74%
$0.32↓#5393↑0.06↓1.5 years↓
"Whenever this creature or another creature you control dies, each opponent loses 1 life and you gain 1 life."
Disciple of the Vault74%
$1.09↓#2502↑0.3223.0 years↑
"Whenever an artifact is put into a graveyard from the battlefield, you may have target opponent lose 1 life."
Funeral Room // Awakening Hall74%
$5.72↑#2140↑0.222.1 years↓
"Whenever a creature you control dies, each opponent loses 1 life and you gain 1 life."
Shard of the Void Dragon74%
$1.91↑#99550.50↑4.0 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."
Pious Evangel // Wayward Disciple73%
$0.13↓#19847↓0.18↓10.5 years↑
"Whenever this creature or another creature you control dies, target opponent loses 1 life and you gain 1 life."
Be'lakor, the Dark Master72%
$3.61↑#76500.12↓4.0 years
"Flying"
Sungrace Pegasus72%
$0.15↓#15278↓0.00↓12.3 years↑
"Flying"