Boltwave 
Sorcery
$2.64 #1397 0.11 1.9 years
Boltwave deals 3 damage to each opponent.
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Cards similar to Boltwave 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.
Storm Caller83%
$0.12↓#22273↓0.00↓6.3 years↑
"When this creature enters, it deals 2 damage to each opponent."
Lava Spike81%
$0.89↓#12519↓0.00↓22.1 years↑
"this card deals 3 damage to target player or planeswalker."
Tectonic Hazard76%
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"this card deals 1 damage to each opponent and each creature they control."
Red Dragon74%
$0.32↓#6639↓0.00↓5.2 years↑
"When this creature enters, it deals 4 damage to each opponent."
Gibbering Fiend73%
$0.32↓#14086↓0.00↓10.5 years↑
"When this creature enters, it deals 1 damage to each opponent."
Legion Guildmage72%
$0.14↓#24473↓0.058.0 years↑
"
,
: This creature deals 3 damage to each opponent."
Glassworks // Shattered Yard72%
$0.15↓#9462↓0.112.1 years
"At the beginning of your end step, this Room deals 1 damage to each opponent."
Dagger Caster72%
$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."
Lasting Tarfire72%
$0.24↓#6199↓0.140.7 years↓
"At the beginning of each end step, if you put a counter on a creature this turn, this enchantment deals 2 damage to each opponent."
Lightning Reaver71%
$0.57↓#20758↓0.28↑17.5 years↑
"At the beginning of your end step, this creature deals damage equal to the number of charge counters on it to each opponent."