Fire Urchin 
Creature — Elemental
$0.05 #25748 0.00 8.0 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%
$0.18↑#20255↑0.005.1 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Kiln Fiend100%
$0.11↑#17248↑0.0616.5 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Aven Wind Mage100%
$0.11↑#233410.33↑8.3 years
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
Wee Dragonauts100%
$0.06↑#18706↑0.28↑20.8 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Mercurial Geists100%
$0.03↓#261020.0610.2 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Ghitu Amplifier95%
$0.12↑#258140.004.1 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Erratic Cyclops95%
$0.15↑#18693↑0.19↑8.0 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
Charmbreaker Devils94%
$0.17↑#7555↑0.11↑15.1 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +4/+0 until end of turn."
Aberrant Manawurm94%
$0.16↑#231710.050.5 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 Weird94%
$0.25↑#229410.0714.0 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn. Untap it."
Pyre Hound93%
$0.07↑#19339↑0.19↑10.5 years↑
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."
+1 more matching line
Electrostatic Infantry93%
$0.34↑#6533↑0.074.1 years↓
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."
Spellrune Painter // Spellrune Howler92%
$0.14↑#209150.005.1 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
Storm Skreelix92%
$0.20↑#18537↑0.075.1 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Nivix Cyclops92%
$0.11↑#225810.0613.5 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."
Frolicking Familiar // Blow Off Steam91%
$0.31↑#8567↑0.11↑3.1 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
Pyroceratops90%
$0.21↑#18678↑0.006.5 years↓
"Trample"
Lorehold Pledgemage90%
$0.17↑#279550.005.5 years↓
"Whenever you cast or copy an instant or sorcery spell, this creature gets +1/+0 until end of turn."
Clever Lumimancer90%
$0.18↑#19689↑0.21↑5.5 years↓
"Whenever you cast or copy an instant or sorcery spell, this creature gets +2/+2 until end of turn."
Umara Mystic90%
$0.17↑#207710.006.1 years↓
"Whenever you cast an instant, sorcery, or Wizard spell, this creature gets +2/+0 until end of turn."