Jackal, Genius Geneticist {G}{U}
Legendary Creature — Human Scientist Villain
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 that do something similar 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 Enigma Jewel // Locus of Enlightenment 83%
$1.20#6378
"Whenever you activate an ability that isn't a mana ability, copy it. You may choose new targets for the copy."
Twinning Staff 82%
$20.59#1706
"If you would copy a spell one or more times, instead copy it that many times plus an additional time. You may choose new targets for the additional copy."
Lumaret's Favor 82%
$0.09#23065
"When you cast this spell, copy it if you gained life this turn. You may choose new targets for the copy."