If an effect allows you to pay an alternative cost rather than a spell's mana cost, you may pay that alternative cost when you jump-start a spell. You'll still discard a card as an additional cost to cast it.
Gravitic Punch
If a card with jump-start is put into your graveyard during your turn, you'll be able to cast it right away if it's legal to do so, before an opponent can take any actions.
If the target creature or the target player is an illegal target as Gravitic Punch tries to resolve, the creature won't deal damage.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Randy Vargas
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
