Disaster Radius 
Sorcery
$0.19 #17440 0.24 16.5 years
As an additional cost to cast this spell, reveal a creature card from your hand.
Disaster Radius deals X damage to each creature your opponents control, where X is the revealed card's mana value.
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Cards similar to Disaster Radius 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.
Living Destiny93%
$0.09↓#31118↓0.06↓16.5 years
"As an additional cost to cast this spell, reveal a creature card from your hand."
Blazing Volley90%
$0.10↓#4422↑0.10↓9.5 years↓
"this card deals 1 damage to each creature your opponents control."
Induce Despair90%
$0.07↓#28569↓0.11↓16.5 years
"As an additional cost to cast this spell, reveal a creature card from your hand."
Simoon85%
$0.20↑#28929↓0.1829.7 years↑
"this card deals 1 damage to each creature target opponent controls."
Call Forth the Tempest84%
$17.48↑#1802↑0.61↑3.0 years↓
"this card deals damage to each creature your opponents control equal to the total mana value of other spells you've cast this turn."
Radiating Lightning84%
$0.10↓#194160.07↓8.5 years↓
"this card deals 3 damage to target player and 1 damage to each creature that player controls."
Iroh's Demonstration83%
$0.28↑#6120↑0.01↓0.9 years↓
"• this card deals 1 damage to each creature your opponents control."
Tectonic Hazard82%
$0.44↑#2718↑0.302.9 years↓
"this card deals 1 damage to each opponent and each creature they control."
Charge of the Forever-Beast82%
$0.16↓#25808↓0.176.5 years↓
"As an additional cost to cast this spell, reveal a creature card from your hand."
Calamity of the Titans82%
$4.11↑#4588↑0.66↑3.2 years↓
"As an additional cost to cast this spell, reveal a colorless creature card from your hand."
+1 more matching line
Thunderwave81%
$0.18↓#7961↑0.06↓4.4 years↓
"this card deals 6 damage to each creature your opponents control."
Soul Immolation78%
$2.94↑#5863↑0.39↑0.7 years↓
"this card deals X damage to each opponent and each creature they control."
Savage Twister78%
$0.14↓#13912↑0.06↓30.0 years↑
"this card deals X damage to each creature."
Whipflare78%
$0.20↑#192680.06↓15.4 years↓
"this card deals 2 damage to each nonartifact creature."
Nahiri's Wrath78%
$0.38↑#178840.11↓10.2 years↓
"this card deals damage equal to the total mana value of the discarded cards to each of up to X target creatures and/or planeswalkers."
Dagger Caster78%
$0.22↑#12313↑0.12↓7.7 years↓
"When this creature enters, it deals 1 damage to each opponent and 1 damage to each creature your opponents control."
Glóin the Mighty // Easy Pickings77%
$0.24↑#7870↑0.170.2 years↓
"this card deals 1 damage to each creature your opponents control."
Boiling Earth77%
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"this card deals 1 damage to each creature your opponents control."
Pyroclasm77%
$0.18↓#7761↑0.06↓31.4 years↑
"this card deals 2 damage to each creature."
End the Festivities76%
$1.13↑#2288↑0.194.9 years↓
"this card deals 1 damage to each opponent and each creature and planeswalker they control."