Expressive Firedancer 
Creature — Human Sorcerer
$0.06 #22223 0.08 0.5 years
Opus — 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.
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Cards similar to Expressive Firedancer 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.
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."
Deluge Virtuoso92%
$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."
Spectacular Skywhale88%
$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 Artist88%
$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."
Kiln Fiend88%
$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 Crasher88%
$0.18↑#202550.005.1 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Fire Urchin88%
$0.05↓#257480.008.0 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +1/+0 until end of turn."
Aven Wind Mage88%
$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 Geists88%
$0.03↓#261020.0610.2 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Wee Dragonauts88%
$0.06#187060.28↑20.8 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Colorstorm Stallion85%
$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."
Elemental Mascot84%
$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."
Erratic Cyclops84%
$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."
Molten-Core Maestro82%
$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."
Blistercoil Weird82%
$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."
Ghitu Amplifier80%
$0.12↑#258140.004.1 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Shantotto, Tactician Magician80%
$0.17↑#9806↑0.60↑1.4 years
"Whenever you cast a noncreature spell, this card gets +X/+0 until end of turn, where X is the amount of mana spent to cast that spell. If X is 4 or more, draw a card."
Pyre Hound80%
$0.07↑#193390.19↑10.5 years↑
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."
Electrostatic Infantry80%
$0.34↑#6533↑0.074.1 years↑
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."
Charmbreaker Devils78%
$0.17↑#7555↑0.1115.1 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +4/+0 until end of turn."