Warstorm Surge 
Enchantment
$0.76 #714 0.45 15.1 years
Whenever a creature you control enters, it deals damage equal to its power to any target.
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Cards similar to Warstorm Surge 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.
Terror of the Peaks96%
$21.41↑#518↑1.17↑6.2 years↓
"Whenever another creature you control enters, this creature deals damage equal to that creature's power to any target."
Electropotence96%
$0.40↓#21447↓0.21↓16.9 years↑
"Whenever a creature you control enters, you may pay 
. If you do, that creature deals damage equal to its power to any target."
. If you do, that creature deals damage equal to its power to any target."
Flayer of the Hatebound92%
$0.24↓#5165↓0.15↓14.6 years
"Whenever this creature or another creature enters from your graveyard, that creature deals damage equal to its power to any target."
Pandemonium92%
$0.43↓#10794↓0.90↑28.2 years↑
"Whenever a creature enters, that creature's controller may have it deal damage equal to its power to any target of their choice."
Where Ancients Tread86%
$0.77↑#11458↓0.12↓17.9 years↑
"Whenever a creature you control with power 5 or greater enters, you may have this enchantment deal 5 damage to any target."
Vigilante Justice82%
$0.06↓#17195↓0.09↓14.3 years
"Whenever a Human you control enters, this enchantment deals 1 damage to any target."
Mila, Crafty Companion // Lukka, Wayward Bonder82%
$0.86↑#9199↓0.425.4 years↓
"−7: You get an emblem with "Whenever a creature you control enters, it deals damage equal to its power to any target.""
Pyrogoyf82%
$1.55↑#6898↓0.17↓2.2 years↓
"Whenever this creature or another Lhurgoyf creature you control enters, that creature deals damage equal to its power to any target."
Raphael, Tough Turtle82%
$0.24↓#11285↓0.00↓0.5 years↓
"Whenever another creature you control enters, this card deals 1 damage to target opponent."
Shocking Sharpshooter82%
$0.30↓#7044↓0.18↓1.4 years↓
"Whenever another creature you control enters, this creature deals 1 damage to target opponent."
Hawkeye, Trick Shot82%
$3.37↑#15619↓0.00↓0.2 years↓
"Whenever this card or another Hero you control enters, it deals damage equal to the number of Heroes you control to any target."
Murderous Redcap78%
$1.04↑#4219↓0.33↓18.3 years↑
"When this creature enters, it deals damage equal to its power to any target."
Scourge of Valkas78%
$3.43↑#1527↓0.4513.1 years↓
"Whenever this creature or another Dragon you control enters, it deals X damage to any target, where X is the number of Dragons you control."
Dragon Tempest78%
$2.54↑#8480.5311.4 years↓
"Whenever a Dragon you control enters, it deals X damage to any target, where X is the number of Dragons you control."
Spikeshot Goblin78%
$0.12↓#16250↓0.00↓22.9 years↑
", 
: This creature deals damage equal to its power to any target."
, : This creature deals damage equal to its power to any target."
Kamahl, Pit Fighter77%
$0.18↓#18157↓0.5024.9 years↑
": this card deals 3 damage to any target."
: this card deals 3 damage to any target."
Murasa Pyromancer76%
$0.19↓#16322↓0.62↑16.9 years↑
"Whenever this creature or another Ally you control enters, you may have this creature deal damage to target creature equal to the number of Allies you control."
Spikeshot Elder76%
$0.26↓#15941↓0.33↓15.9 years
"
: This creature deals damage equal to its power to any target."
: This creature deals damage equal to its power to any target."
Be'lakor, the Dark Master76%
$4.11↑#7458↓0.24↓3.9 years↓
"Whenever another Demon you control enters, it deals damage equal to its power to any target."
Forgeborn Oreads76%
$0.29↓#14996↓0.06↓12.3 years↓
"Whenever this creature or another enchantment you control enters, this creature deals 1 damage to any target."