Simoon 
Instant
$0.20 #28929 0.18 29.7 years
Simoon deals 1 damage to each creature target opponent controls.
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Cards similar to Simoon 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.
Radiating Lightning96%
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"this card deals 3 damage to target player and 1 damage to each creature that player controls."
Blazing Volley95%
$0.10↓#4422↑0.109.5 years↓
"this card deals 1 damage to each creature your opponents control."
Dwarven Catapult90%
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"this card deals X damage divided evenly, rounded down, among all creatures target opponent controls."
Tectonic Hazard90%
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"this card deals 1 damage to each opponent and each creature they control."
Thunderwave88%
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"this card deals 6 damage to each creature your opponents control."
Aggravate88%
$0.08↓#236970.1214.5 years↓
"this card deals 1 damage to each creature target player controls. Each creature dealt damage this way attacks this turn if able."
Iroh's Demonstration88%
$0.28↑#6120↑0.01↓0.9 years↓
"• this card deals 1 damage to each creature your opponents control."
Chandra's Fury88%
$0.11↓#16507↑0.1214.3 years↓
"this card deals 4 damage to target player or planeswalker and 1 damage to each creature that player or that planeswalker's controller controls."
Fear, Fire, Foes!88%
$0.19↓#8869↑0.06↓3.3 years↓
"Damage can't be prevented this turn. this card deals X damage to target creature and 1 damage to each other creature with the same controller."
Seismic Wave88%
$0.18↓#20109↑0.06↓4.7 years↓
"this card deals 2 damage to any target and 1 damage to each nonartifact creature target opponent controls."
Mizzium Mortars87%
$0.47↑#3073↑0.2114.0 years↓
"this card deals 4 damage to target creature you don't control."
Electrickery87%
$0.23↑#4667↑0.1814.0 years↓
"this card deals 1 damage to target creature you don't control."
Dagger Caster87%
$0.22↑#12313↑0.127.7 years↓
"When this creature enters, it deals 1 damage to each opponent and 1 damage to each creature your opponents control."
Flames of the Raze-Boar86%
$0.06↓#255550.117.7 years↓
"this card deals 4 damage to target creature an opponent controls. Then this card deals 2 damage to each other creature that player controls if you control a creature with power 4 or greater."
Flame Wave86%
$0.13↓#235230.2428.6 years↓
"this card deals 4 damage to target player or planeswalker and each creature that player or that planeswalker's controller controls."
Savage Alliance86%
$0.18↓#18389↑0.1410.2 years↓
"• this card deals 1 damage to each creature target opponent controls."
Lavalanche86%
$0.16↓#9362↑0.36↑17.5 years↓
"this card deals X damage to target player or planeswalker and each creature that player or that planeswalker's controller controls."
Disaster Radius85%
$0.19↓#17440↑0.2416.5 years↓
"this card deals X damage to each creature your opponents control, where X is the revealed card's mana value."
Boiling Earth84%
$0.07↓#12157↑0.00↓11.0 years↓
"this card deals 1 damage to each creature your opponents control."
Photon Blast Barrage84%
$0.21↑#18468↑0.160.3 years↓
"this card deals 1 damage to target creature."