Pyre Hound 
Creature — Elemental Dog
$0.07 #19339 0.19 10.5 years
Trample
Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature.
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Cards similar to Pyre Hound 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 Infantry100%
$0.34↑#6533↑0.07↓4.1 years↓
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."
Aven Wind Mage93%
$0.11↑#23341↓0.33↑8.3 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
Fire Urchin93%
$0.05↓#25748↓0.00↓8.0 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +1/+0 until end of turn."
+1 more matching line
Wee Dragonauts93%
$0.06↓#187060.2820.8 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Festival Crasher93%
$0.18↑#202550.00↓5.1 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Mercurial Geists92%
$0.03↓#26102↓0.06↓10.2 years
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Kiln Fiend92%
$0.11↑#172480.06↓16.5 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Quandrix Pledgemage92%
$0.17↑#218780.00↓5.5 years↓
"Whenever you cast or copy an instant or sorcery spell, put a +1/+1 counter on this creature."
Erratic Cyclops90%
$0.15↑#186930.198.0 years↓
"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."
+1 more matching line
Tackle Artist89%
$0.18↑#187490.06↓0.5 years↓
"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
Caldera Pyremaw88%
$0.68↑#4377↑0.56↑1.5 years↓
"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."
Ghitu Amplifier88%
$0.12↑#25814↓0.00↓4.1 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Karok Wrangler88%
$0.16↑#209280.135.5 years↓
"Whenever you cast or copy an instant or sorcery spell, put a +1/+1 counter on target creature you control."
Aberrant Manawurm88%
$0.16↑#231710.05↓0.5 years↓
"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
Blistercoil Weird87%
$0.25↑#229410.07↓14.0 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn. Untap it."
Charmbreaker Devils86%
$0.17↑#7555↑0.1115.1 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +4/+0 until end of turn."
Nivix Cyclops86%
$0.11↑#225810.06↓13.5 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn and can attack this turn as though it didn't have defender."
Lecturing Scornmage86%
$0.17↑#181690.09↓0.5 years↓
"Whenever you cast an instant or sorcery spell that targets a creature, put a +1/+1 counter on this creature."
Spectacular Skywhale86%
$0.16↑#190160.04↓0.5 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn. If five or more mana was spent to cast that spell, put three +1/+1 counters on this creature instead."
Chandra's Emberling86%
$0.17↑#25096↓0.100.0 years↓
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."