Jackal, Genius Geneticist
Legendary Creature — Human Scientist Villain
1 / 1
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.)
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.