Pyre Hound {3}{R}
Creature — Elemental Dog
Trample
Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature.
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Cards that do something similar 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.
Electrostatic Infantry 100%
$0.30#6215
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."
Caldera Pyremaw 99%
$0.28#4758
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature. Then this creature deals damage equal to its power to target opponent."
Molten-Core Maestro 98%
$0.37#9288
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature. If five or more mana was spent to cast that spell, add an amount of {R} equal to this creature's power."
Quandrix Pledgemage 91%
$0.17#21223
"Whenever you cast or copy an instant or sorcery spell, put a +1/+1 counter on this creature."
Dragonsguard Elite 91%
$0.27#15967
"Whenever you cast or copy an instant or sorcery spell, put a +1/+1 counter on this creature."
Murktide Regent 90%
$6.53#14883
"Whenever an instant or sorcery card leaves your graveyard, put a +1/+1 counter on this creature."
Scolding Administrator 86%
$0.20#18637
"Whenever you cast an instant or sorcery spell that targets a creature, put a +1/+1 counter on this creature."
Lecturing Scornmage 86%
$0.17#19036
"Whenever you cast an instant or sorcery spell that targets a creature, put a +1/+1 counter on this creature."
Prismari Apprentice 86%
$0.16#21939
"Whenever you cast or copy an instant or sorcery spell, this creature can't be blocked this turn. If that spell has mana value 5 or greater, put a +1/+1 counter on this creature."
Tackle Artist 86%
$0.13#20104
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature. If five or more mana was spent to cast that spell, put two +1/+1 counters on this creature instead."
+1 more matching line
Colorstorm Stallion 86%
$0.43#14924
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn. If five or more mana was spent to cast that spell, create a token that's a copy of this creature."
Aberrant Manawurm 85%
$0.09#24017
"Whenever you cast an instant or sorcery spell, this creature gets +X/+0 until end of turn, where X is the amount of mana spent to cast that spell."
+1 more matching line
Renegade Bull 85%
$0.23#15025
"Whenever you cast an instant or sorcery spell, this creature gets +X/+0 until end of turn, where X is that spell's mana value."
Erratic Cyclops 85%
$0.20#17911
"Whenever you cast an instant or sorcery spell, this creature gets +X/+0 until end of turn, where X is that spell's mana value."
Expressive Firedancer 84%
$0.08#22911
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn. If five or more mana was spent to cast that spell, this creature also gains double strike until end of turn."
Frolicking Familiar // Blow Off Steam 84%
$0.24#7735
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
Aven Wind Mage 84%
$0.16#22687
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
Spellrune Painter // Spellrune Howler 84%
$0.17#20131
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
Fire Urchin 84%
$0.08#24988
"Whenever you cast an instant or sorcery spell, this creature gets +1/+0 until end of turn."