wotc
You can cast Primal Might with 0 as the value of X to just have the two target creatures fight.
You can cast Primal Might with 0 as the value of X to just have the two target creatures fight.
If you choose two target creatures and either target is an illegal target as Primal Might tries to resolve, neither creature will deal or be dealt damage.
If the creature you control is an illegal target as Primal Might tries to resolve, no creature gets +X/+X. If that creature is a legal target but the creature you don't control isn't, it still gets +X/+X.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Jon Juarez
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
You can cast Primal Might targeting only the creature you control.