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.)
1/1
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If the spell that's copied has an X whose value was determined as it was cast, the copy will have the same value of X.
If a spell has in its mana cost, use the value chosen for that X to determine the mana value of that spell.