Fire Urchin 
Creature — Elemental
$0.07 #25447 0.62 7.9 years
Trample
Whenever you cast an instant or sorcery spell, this creature gets +1/+0 until end of turn.
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Cards similar to Fire Urchin 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.
Festival Crasher100%
$0.17↑#19995↑0.22↓4.9 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Kiln Fiend100%
$0.10↑#16947↑0.27↓16.4 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Aven Wind Mage100%
$0.08↑#230160.31↓8.1 years
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
Wee Dragonauts100%
$0.05↓#18358↑0.29↓20.7 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Mercurial Geists100%
$0.04↓#257740.25↓10.1 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Erratic Cyclops94%
$0.15↑#18347↑0.50↓7.9 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
Blistercoil Weird93%
$0.23↑#226030.31↓13.9 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn. Untap it."
Aberrant Manawurm92%
$0.11↑#233560.00↓0.4 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."
Electrostatic Infantry92%
$0.35↑#6376↑0.28↓4.0 years↓
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."
+1 more matching line
Pyre Hound92%
$0.07#18983↑0.00↓10.4 years↑
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."
Fluxcharger92%
$0.10↑#281640.06↓13.3 years↑
"Whenever you cast an instant or sorcery spell, you may switch this creature's power and toughness until end of turn."
Ghitu Amplifier91%
$0.08↑#254630.00↓4.0 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Nivix Cyclops90%
$0.08↑#222320.6213.3 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."
Charmbreaker Devils90%
$0.17↑#7398↑0.18↓14.9 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +4/+0 until end of turn."
Rehearsed Debater88%
$0.03↓#246540.00↓0.4 years↓
"Whenever you cast an instant or sorcery spell that targets a creature, this creature gets +1/+1 until end of turn."
Spellrune Painter // Spellrune Howler88%
$0.15↑#206010.13↓4.9 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
Umara Mystic88%
$0.15↑#20341↑0.06↓5.9 years↓
"Whenever you cast an instant, sorcery, or Wizard spell, this creature gets +2/+0 until end of turn."
Frolicking Familiar // Blow Off Steam86%
$0.30↑#8235↑0.25↓3.0 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
Storm Skreelix85%
$0.17↑#18105↑0.18↓4.9 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Unruly Catapult84%
$0.34↑#4263↑0.20↓3.0 years↓
"Whenever you cast an instant or sorcery spell, untap this creature."