Jackal, Genius Geneticist 

Legendary Creature — Human Scientist Villain
$0.27 #15444 0.49 1.0 years
Trample
Whenever you cast a creature spell with mana value equal to Jackal's power, copy that spell, except the copy isn't legendary. Then put a +1/+1 counter on Jackal. (The copy becomes a token.)
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Cards similar to Jackal, Genius Geneticist 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.
The Clone Saga78%
$0.25↓#9450↑0.37↓1.0 years
"When you next cast a creature spell this turn, copy it, except the copy isn't legendary."
Case of the Shifting Visage76%
$0.33↑#8997↑0.422.6 years↑
"Solved — Whenever you cast a nonlegendary creature spell, copy that spell."
Double Major76%
$1.82↑#3061↑0.445.4 years↑
"Copy target creature spell you control, except it isn't legendary if the spell is legendary."
Iron Man, Bleeding Edge74%
$2.49↑#10576↑0.00↓0.2 years
"Whenever you cast an artifact spell, you may copy it, except the copy isn't legendary. Do this only once each turn."
Irma, Part-Time Mutant74%
$4.61↑#3753↑0.00↓0.5 years
"At the beginning of combat on your turn, this card becomes a copy of up to one other target creature you control, except her name is this card and she has this ability. Then put a +1/+1 counter on her."
The Sixth Doctor72%
$0.39↑#6551↑0.15↓2.9 years↑
"Whenever you cast a historic spell, copy it, except the copy isn't legendary. This ability triggers only once each turn."