Cheapest priced copy (Marvel's Spider-Man): $0.49 at Card Kingdom, near mint, their price list as of .
Jackal, Genius Geneticist 
Legendary Creature — Human Scientist Villain · 1/1 · Rare · Marvel's Spider-Man · #131
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.)
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
3 printings · $0.49 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Marvel's Spider-Man Promos | 131s | Rare | — | $0.69 |
| Marvel's Spider-Man | 131 | Rare | $0.49 | $0.79 |
| Marvel's Spider-Man | 272 | Rare | $0.49 | $0.79 |
2 rulings from Wizards of the Coast
- 19 September 2025If a spell has {X} in its mana cost, use the value chosen for that X to determine the mana value of that spell.
- 19 September 2025If 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.