Jackal, Genius Geneticist 

Legendary Creature — Human Scientist Villain
$0.28 #15521 0.15 1.1 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?
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The Clone Saga78%
$0.25↓#9226↑0.25↑1.1 years
"When you next cast a creature spell this turn, copy it, except the copy isn't legendary."
Double Major76%
$1.76↑#3136↑0.39↑5.5 years↑
"Copy target creature spell you control, except it isn't legendary if the spell is legendary."
Case of the Shifting Visage76%
$0.36↑#8795↑0.132.7 years↑
"Solved — Whenever you cast a nonlegendary creature spell, copy that spell."
Iron Man, Bleeding Edge74%
$2.41↑#9295↑0.59↑0.3 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%
$4.09↑#3406↑0.45↑0.6 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%
$0.37↑#6688↑0.53↑3.0 years↑
"Whenever you cast a historic spell, copy it, except the copy isn't legendary. This ability triggers only once each turn."
Reflections of Littjara72%
$1.70↑#694↑0.51↑5.7 years↑
"Whenever you cast a spell of the chosen type, copy that spell."