Surtr, Fiery Jötun 
Legendary Creature — Giant God Warrior
$10.52 #7429 0.29 2.3 years
Trample (This creature can deal excess combat damage to the player it's attacking.)
Whenever you cast a historic spell, Surtr deals 3 damage to any target. (Artifacts, legendaries, and Sagas are historic.)
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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.
Embersmith87%
$0.13↓#29794↓0.06↓16.1 years↑
"Whenever you cast an artifact spell, you may pay 
. If you do, this creature deals 1 damage to any target."
. If you do, this creature deals 1 damage to any target."
Labyrinth Champion84%
$0.17↓#25256↓0.07↓13.1 years↑
"Whenever you cast a spell that targets this creature, this creature deals 2 damage to any target."
Cabal Paladin83%
$0.16↓#16583↓0.18↓8.5 years↑
"Whenever you cast a historic spell, this creature deals 2 damage to each opponent."
Dreamstalker Manticore82%
$0.12↓#26946↓0.12↓6.7 years↑
"Whenever you cast your first spell during each opponent's turn, this creature deals 1 damage to any target."
Pyromancer's Assault82%
$0.11↓#23107↓0.11↓10.7 years↑
"Whenever you cast your second spell each turn, this enchantment deals 2 damage to any target."
Pyroconvergence82%
$0.14↓#26681↓0.2514.0 years↑
"Whenever you cast a multicolored spell, this enchantment deals 2 damage to any target."
Toralf, God of Fury // Toralf's Hammer82%
$4.84↓#4924↑0.315.7 years↑
"Trample"
Burning Vengeance82%
$0.12↓#13147↓0.12↓15.1 years↑
"Whenever you cast a spell from your graveyard, this enchantment deals 2 damage to any target."
Imminent Doom81%
$0.13↓#25326↓0.219.3 years↑
"Whenever you cast a spell with mana value equal to the number of doom counters on this enchantment, this enchantment deals that much damage to any target. Then put a doom counter on this enchantment."
Kamahl, Pit Fighter81%
$0.20↓#18568↓0.13↓25.1 years↑
"
: this card deals 3 damage to any target."
: this card deals 3 damage to any target."
Wrathful Raptors80%
$7.22↓#2646↑0.45↑2.9 years
"Trample"
Thorin Oakenshield80%
$0.23↓#85050.18↓0.2 years↓
"Trample"
Molten Nursery80%
$0.15↓#23441↓0.11↓11.0 years↑
"Whenever you cast a colorless spell, this enchantment deals 1 damage to any target."
Cinder Hellion80%
$0.05↓#27438↓0.00↓10.7 years↑
"Trample"
Rumbling Aftershocks80%
$0.07↓#30896↓0.07↓16.7 years↑
"Whenever you cast a kicked spell, you may have this enchantment deal damage to any target equal to the number of times that spell was kicked."
Aladdin's Ring79%
$0.26↓#24959↓0.1932.8 years↑
"
, : This artifact deals 4 damage to any target."
, : This artifact deals 4 damage to any target."
D'Avenant Trapper79%
$0.03↓#23724↓0.298.5 years↑
"Whenever you cast a historic spell, tap target creature an opponent controls."
Mana Cannons78%
$0.57↓#9707↓0.204.1 years↑
"Whenever you cast a multicolored spell, this enchantment deals X damage to any target, where X is the number of colors that spell is."
Screamer-Killer78%
$0.58↓#9885↓0.65↑4.0 years↑
"Whenever you cast a creature spell with mana value 5 or greater, this creature deals 5 damage to any target."
+1 more matching line
Magmatic Force78%
$0.38↓#10196↓0.40↑15.3 years↑
"At the beginning of each upkeep, this creature deals 3 damage to any target."