Warstorm Surge 
Enchantment
$0.51 #731 0.54 15.3 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%
$27.13↑#512↑1.18↑6.3 years↓
"Whenever another creature you control enters, this creature deals damage equal to that creature's power to any target."
Electropotence96%
$0.39↓#21646↓0.21↓17.0 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%
$0.23↓#5192↓0.12↓14.7 years
"Whenever this creature or another creature enters from your graveyard, that creature deals damage equal to its power to any target."
Pandemonium92%
$0.40↓#10944↓0.74↑28.3 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%
$0.73↑#11656↓0.32↓18.0 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%
$0.08↓#17436↓0.00↓14.5 years
"Whenever a Human you control enters, this enchantment deals 1 damage to any target."
Mila, Crafty Companion // Lukka, Wayward Bonder82%
$1.09↑#8691↓0.11↓5.5 years↓
"−7: You get an emblem with "Whenever a creature you control enters, it deals damage equal to its power to any target.""
Pyrogoyf82%
$1.26↑#7042↓0.28↓2.3 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%
$0.23↓#10739↓0.18↓0.6 years↓
"Whenever another creature you control enters, this card deals 1 damage to target opponent."
Shocking Sharpshooter82%
$0.33↓#6942↓0.14↓1.5 years↓
"Whenever another creature you control enters, this creature deals 1 damage to target opponent."
Hawkeye, Trick Shot82%
$3.00↑#14666↓0.38↓0.3 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%
$1.23↑#4220↓0.43↓18.5 years↑
"When this creature enters, it deals damage equal to its power to any target."
Dragon Tempest78%
$1.46↑#8420.6211.6 years↓
"Whenever a Dragon you control enters, it deals X damage to any target, where X is the number of Dragons you control."
Scourge of Valkas78%
$1.25↑#1506↓0.5913.3 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."
Spikeshot Goblin78%
$0.16↓#16528↓0.29↓23.0 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%
$0.20↓#18568↓0.13↓25.1 years↑
": this card deals 3 damage to any target."
: this card deals 3 damage to any target."
Murasa Pyromancer76%
$0.19↓#16598↓0.00↓17.0 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%
$0.28↓#16099↓0.00↓16.1 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%
$3.61↑#7650↓0.12↓4.0 years↓
"Whenever another Demon you control enters, it deals damage equal to its power to any target."
Forgeborn Oreads76%
$0.27↓#15406↓0.00↓12.5 years↓
"Whenever this creature or another enchantment you control enters, this creature deals 1 damage to any target."