Jackal, Genius Geneticist

Legendary Creature — Human Scientist Villain

{G}{U}

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

Rulings and every printing on Scryfall