Herald of Ilharg 
Creature — Boar Beast
$3.66 #11555 0.24 2.5 years
Trample
Whenever you cast a creature spell, put two +1/+1 counters on this creature. If that spell has mana value 5 or greater, this creature deals damage equal to the number of counters on it to each opponent.
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Cards similar to Herald of Ilharg 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.
Angry Rabble92%
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Stormkeld Prowler90%
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"Whenever you cast a spell with mana value 5 or greater, put two +1/+1 counters on this creature."
Kurgadon90%
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"Whenever you cast a creature spell with mana value 6 or greater, put three +1/+1 counters on this creature."
Ascendant Packleader90%
$0.38↓#8310↑0.50↑4.8 years↑
"Whenever you cast a spell with mana value 4 or greater, put a +1/+1 counter on this creature."
Lurking Lizards90%
$0.11↓#18848↓0.261.0 years↓
"Whenever you cast a spell with mana value 4 or greater, put a +1/+1 counter on this creature."
+1 more matching line
Kalemne, Disciple of Iroas86%
$14.57↑#8437↑0.00↓10.8 years↑
"Whenever you cast a creature spell with mana value 5 or greater, you get an experience counter."
Tempest Hart // Scan the Clouds84%
$0.19↓#120040.00↓3.0 years
"Whenever you cast a spell with mana value 5 or greater, put a +1/+1 counter on this creature."
Hallar, the Firefletcher82%
$0.24↓#20198↓0.36↑8.4 years↑
"Whenever you cast a spell, if that spell was kicked, put a +1/+1 counter on this card, then this card deals damage equal to the number of +1/+1 counters on it to each opponent."
+1 more matching line
Zuri, Warrior of Wakanda80%
$0.23↓#17897↓0.00↓0.2 years↓
"Whenever you cast an artifact spell with mana value 4 or greater, put a +1/+1 counter on each creature you control."
+1 more matching line
Savanti Romero, Time's Exile79%
$0.28↓#14483↓0.00↓0.5 years↓
"Trample"
Carnage Wurm78%
$0.14↓#18932↓0.2915.1 years↑
"Trample"
Scab-Clan Mauler78%
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"Trample"
Runadi, Behemoth Caller78%
$16.16↑#7684↑0.193.8 years↑
"Whenever you cast a creature spell with mana value 5 or greater, that creature enters with X additional +1/+1 counters on it, where X is its mana value minus 4."
Jackal, Genius Geneticist78%
$0.27↓#15444↓0.49↑1.0 years↓
"Trample"
Lasting Tarfire76%
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"At the beginning of each end step, if you put a counter on a creature this turn, this enchantment deals 2 damage to each opponent."
Hobblefiend76%
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"Trample"
Territorial Scythecat76%
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"Trample"
T'Challa, the Black Panther76%
$0.46↓#16005↓0.00↓0.2 years↓
"Whenever you cast an artifact spell with mana value 4 or greater, put two +1/+1 counters on this card."
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"Whenever you cast a noncreature spell, put a +1/+1 counter on this card and it deals 1 damage to each opponent."