Lightning Diadem 
Enchantment — Aura
$0.07 #27568 0.00 12.3 years
Enchant creature
When this Aura enters, it deals 2 damage to any target.
Enchanted creature gets +2/+2.
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Cards similar to Lightning Diadem 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.
Sparkmage Apprentice99%
$0.07#263760.29↑20.9 years↑
"When this creature enters, it deals 1 damage to any target."
Skeleton Archer99%
$0.05↓#21683↑0.008.1 years↓
"When this creature enters, it deals 1 damage to any target."
Blisterstick Shaman99%
$0.03↓#255290.40↑15.6 years↑
"When this creature enters, it deals 1 damage to any target."
Akoum Boulderfoot99%
$0.05↓#291430.29↑16.4 years↑
"When this creature enters, it deals 1 damage to any target."
Nebula Dragon98%
$0.12↑#20349↑0.081.1 years↓
"When this creature enters, it deals 3 damage to any target."
Lion Heart98%
$0.19↑#13651↑0.091.2 years↓
"When this Equipment enters, it deals 2 damage to any target."
Ghitu Slinger97%
$0.15↑#298960.25↑27.6 years↑
"When this creature enters, it deals 2 damage to any target."
Galvanic Arc96%
$0.20↑#19428↑0.0020.9 years↑
"When this Aura enters, it deals 3 damage to any target."
Twinshot Sniper96%
$0.29↑#10593↑0.16↑4.5 years↓
"When this creature enters, it deals 2 damage to any target."
Zuko's Offense95%
$0.23↑#19976↑0.000.8 years↓
"this card deals 2 damage to any target."
Scorching Spear94%
$0.14↑#296930.43↑29.3 years↑
"this card deals 1 damage to any target."
Explosive Impact94%
$0.10↑#258060.25↑13.9 years↑
"this card deals 5 damage to any target."
Volcanic Hammer94%
$0.08↑#21699↑0.26↑29.3 years↑
"this card deals 3 damage to any target."
Lightning Strike94%
$0.10↑#2314↑0.18↑12.9 years
"this card deals 3 damage to any target."
Open Fire94%
$0.06↓#234690.009.1 years↓
"this card deals 3 damage to any target."
Precision Bolt94%
$0.17↑#272780.007.9 years↓
"this card deals 3 damage to any target."
Searing Spear94%
$0.09↑#16650↑0.27↑14.1 years↑
"this card deals 3 damage to any target."
Fire Ambush94%
$4.33↑#297470.0027.3 years↑
"this card deals 3 damage to any target."
Shock94%
$0.05↓#2217↑0.0828.5 years↑
"this card deals 2 damage to any target."
Lightning Blast94%
$0.19↑#222090.0028.9 years↑
"this card deals 4 damage to any target."