Shockmaw Dragon 
Creature — Dragon
$0.21 #22178 0.12 11.7 years
Flying
Whenever this creature deals combat damage to a player, it deals 1 damage to each creature that player controls.
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Cards similar to Shockmaw Dragon 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.
Balefire Dragon94%
$15.67↑#1282↑0.81↑15.1 years↑
"Whenever this creature deals combat damage to a player, it deals that much damage to each creature that player controls."
Spark Mage90%
$2.55↑#10597↑0.1825.1 years↑
"Whenever this creature deals combat damage to a player, you may have this creature deal 1 damage to target creature that player controls."
Swathcutter Giant86%
$0.17↓#214020.27↑8.0 years↓
"Whenever this creature attacks, it deals 1 damage to each creature defending player controls."
Forgestoker Dragon86%
$0.27↑#218880.0712.7 years
"Flying"
Mawcor86%
$0.31↑#28083↓0.1129.0 years↑
"Flying"
Skirk Commando85%
$0.06↓#250530.58↑24.0 years↑
"Whenever this creature deals combat damage to a player, you may have it deal 2 damage to target creature that player controls."
Blazing Volley84%
$0.10↓#4422↑0.109.5 years↓
"this card deals 1 damage to each creature your opponents control."
Shivan Hellkite84%
$0.28↑#197340.00↓28.0 years↑
"Flying"
Freewind Equenaut84%
$0.10↓#28476↓0.0521.2 years↑
"Flying"
Oros, the Avenger82%
$0.70↑#195780.26↑19.7 years↑
"Whenever this card deals combat damage to a player, you may pay 
. If you do, this card deals 3 damage to each nonwhite creature."
. If you do, this card deals 3 damage to each nonwhite creature."
Harbinger of the Hunt82%
$0.16↓#10768↑0.27↑11.6 years
"Flying"
Snapping Thragg82%
$0.07↓#31144↓0.1824.0 years↑
"Whenever this creature deals combat damage to a player, you may have it deal 3 damage to target creature that player controls."
Chandra Nalaar82%
$0.73↑#14454↑0.25↑19.0 years↑
"−8: this card deals 10 damage to target player or planeswalker and each creature that player or that planeswalker's controller controls."
Iroh's Demonstration81%
$0.28↑#6120↑0.01↓0.9 years↓
"• this card deals 1 damage to each creature your opponents control."
Dagger Caster81%
$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."
Scalding Salamander81%
$0.29↑#28421↓0.1728.3 years↑
"Whenever this creature attacks, you may have it deal 1 damage to each creature without flying defending player controls."
Simoon80%
$0.20↓#28929↓0.1829.7 years↑
"this card deals 1 damage to each creature target opponent controls."
Ronin Cliffrider80%
$0.36↑#224770.0521.7 years↑
"Whenever this creature attacks, you may have it deal 1 damage to each creature defending player controls."
Radiating Lightning79%
$0.10↓#194160.078.5 years↓
"this card deals 3 damage to target player and 1 damage to each creature that player controls."
Tectonic Hazard78%
$0.44↑#2718↑0.30↑2.9 years↓
"this card deals 1 damage to each opponent and each creature they control."