Chain Reaction 
Sorcery
$0.23 #707 0.34 16.7 years
Chain Reaction deals X damage to each creature, where X is the number of creatures on the battlefield.
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Cards similar to Chain Reaction 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.
Blasphemous Act88%
$0.74↑#22↑0.67↑15.1 years↓
"this card deals 13 damage to each creature."
Volcanic Wind88%
$0.25↑#26291↓0.13↓27.0 years↑
"this card deals X damage divided as you choose among any number of target creatures, where X is the number of creatures on the battlefield as you cast this spell."
Incite Rebellion85%
$0.38↑#16950↓0.3112.0 years↓
"For each player, this card deals damage to that player and each creature that player controls equal to the number of creatures they control."
Desert Sandstorm84%
$2.95↑#29052↓0.00↓27.5 years↑
"this card deals 1 damage to each creature."
Deploy to the Front81%
$2.08↑#6244↓0.11↓12.0 years↓
"Create X 1/1 white Soldier creature tokens, where X is the number of creatures on the battlefield."
Phyrexian Rebirth80%
$0.24↑#4381↓0.3215.7 years
"Destroy all creatures, then create an X/X colorless Phyrexian Horror artifact creature token, where X is the number of creatures destroyed this way."
Savage Twister80%
$0.14↓#13912↓0.06↓30.0 years↑
"this card deals X damage to each creature."
Pyroclasm80%
$0.18↓#7761↓0.06↓31.4 years↑
"this card deals 2 damage to each creature."
Sweltering Suns79%
$0.17↓#11534↓0.06↓9.5 years↓
"this card deals 3 damage to each creature."
Fumigate78%
$0.25↑#997↓0.47↑10.1 years↓
"Destroy all creatures. You gain 1 life for each creature destroyed this way."
Chaos Maw78%
$0.22↓#22708↓0.269.3 years↓
"When this creature enters, it deals 3 damage to each other creature."
Sunfall78%
$0.32↑#3463↓0.95↑3.5 years↓
"Exile all creatures. Incubate X, where X is the number of creatures exiled this way."
Starstorm78%
$0.24↑#3119↓0.20↓24.0 years↑
"this card deals X damage to each creature."
Slice and Dice78%
$0.11↓#14634↓0.00↓24.0 years↑
"this card deals 4 damage to each creature."
Avenge77%
$0.29↑#15071↓0.320.3 years↓
"Destroy all creatures. You gain 1 life for each creature destroyed this way."
War Report76%
$0.17↓#10350↓0.2915.4 years↓
"You gain life equal to the number of creatures on the battlefield plus the number of artifacts on the battlefield."
Crater Hellion76%
$0.12↓#19423↓0.00↓28.0 years↑
"When this creature enters, it deals 4 damage to each other creature."
Deadly Tempest75%
$0.43↑#3799↓0.73↑10.9 years↓
"Destroy all creatures. Each player loses life equal to the number of creatures they controlled that were destroyed this way."
Scourge of Geier Reach75%
$0.07↓#25162↓0.16↓15.1 years↓
"This creature gets +1/+1 for each creature your opponents control."
Vanquish the Horde74%
$0.25↑#7850.60↑5.1 years↓
"This spell costs 
less to cast for each creature on the battlefield."
less to cast for each creature on the battlefield."