Lightning Diadem 
Enchantment — Aura
$0.07 #27834 0.00 12.5 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.
Blisterstick Shaman99%
$0.05↓#257790.0615.7 years↑
"When this creature enters, it deals 1 damage to any target."
Sparkmage Apprentice99%
$0.08↑#267900.0621.0 years↑
"When this creature enters, it deals 1 damage to any target."
Skeleton Archer99%
$0.05↓#22023↑0.008.3 years↓
"When this creature enters, it deals 1 damage to any target."
Akoum Boulderfoot99%
$0.07#294770.20↑16.5 years↑
"When this creature enters, it deals 1 damage to any target."
Nebula Dragon98%
$0.16↑#20357↑0.23↑1.2 years↓
"When this creature enters, it deals 3 damage to any target."
Lion Heart98%
$0.20↑#13591↑0.001.4 years↓
"When this Equipment enters, it deals 2 damage to any target."
Ghitu Slinger97%
$0.14↑#303320.0027.7 years↑
"When this creature enters, it deals 2 damage to any target."
Galvanic Arc96%
$0.20↑#19819↑0.0621.0 years↑
"When this Aura enters, it deals 3 damage to any target."
Twinshot Sniper96%
$0.23↑#10852↑0.004.7 years↓
"When this creature enters, it deals 2 damage to any target."
Zuko's Offense95%
$0.16↑#19966↑0.090.9 years↓
"this card deals 2 damage to any target."
Ajani's Anguish94%
$0.84↑#12875↑0.14↑0.0 years↓
"When this enchantment enters, it deals X damage to any target."
Scorching Spear94%
$0.10↑#301270.0029.5 years↑
"this card deals 1 damage to any target."
Explosive Impact94%
$0.09↑#260800.12↑14.0 years↑
"this card deals 5 damage to any target."
Lightning Strike94%
$0.08↑#2263↑0.0913.1 years
"this card deals 3 damage to any target."
Fire Ambush94%
$4.45↑#300640.0627.5 years↑
"this card deals 3 damage to any target."
Searing Spear94%
$0.12↑#16978↑0.0014.3 years↑
"this card deals 3 damage to any target."
Precision Bolt94%
$0.18↑#275200.008.0 years↓
"this card deals 3 damage to any target."
Volcanic Hammer94%
$0.12↑#22098↑0.0029.5 years↑
"this card deals 3 damage to any target."
Open Fire94%
$0.04↓#237670.009.3 years↓
"this card deals 3 damage to any target."
Shock94%
$0.05↓#2222↑0.0728.6 years↑
"this card deals 2 damage to any target."