Aberrant Manawurm 
Creature — Wurm
$0.16 #23171 0.05 0.5 years
Trample
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.
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Cards similar to Aberrant Manawurm 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.
Deluge Virtuoso94%
$0.09↓#210120.140.5 years
"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 gets +2/+2 until end of turn instead."
Expressive Firedancer94%
$0.06↓#222230.080.5 years
"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."
Fire Urchin94%
$0.05↓#257480.008.0 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +1/+0 until end of turn."
+1 more matching line
Kiln Fiend94%
$0.11↓#17248↑0.0616.5 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Festival Crasher94%
$0.18↑#202550.005.1 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Aven Wind Mage94%
$0.11↓#233410.33↑8.3 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
Mercurial Geists94%
$0.03↓#261020.0610.2 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Wee Dragonauts94%
$0.06↓#187060.28↑20.8 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Spectacular Skywhale92%
$0.16#190160.040.5 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."
Tackle Artist92%
$0.18↑#187490.060.5 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
Erratic Cyclops91%
$0.15↓#186930.19↑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
Colorstorm Stallion90%
$0.41↑#13917↑0.24↑0.5 years
"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."
Junkblade Bruiser90%
$0.15↓#14933↑0.062.2 years↑
"Trample"
Blistercoil Weird90%
$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."
Elemental Mascot90%
$0.11↓#204240.080.5 years
"Whenever you cast an instant or sorcery spell, this creature gets +1/+0 until end of turn. If five or more mana was spent to cast that spell, exile the top card of your library. You may play that card until the end of your next turn."
Molten-Core Maestro88%
$0.40↑#7642↑0.28↑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, add an amount of 
equal to this creature's power."
equal to this creature's power."
Pyre Hound88%
$0.07↓#193390.19↑10.5 years↑
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."
+1 more matching line
Electrostatic Infantry88%
$0.34↑#6533↑0.074.1 years↑
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."
Ghitu Amplifier86%
$0.12↓#258140.004.1 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Pyroceratops86%
$0.21↑#186780.006.5 years↑
"Trample"