Use the Elf Ball to Catch Magical Girls to Fight

Hello everyone, my name is Gu Tianya, and I have traveled to a magical world. Although I don't know magic, the system can give me elf balls, but I want to catch powerful monsters, and I lack a girl who knows magic, so I have to use her to fight. This girl who knows magic is so stupid. Although she knows powerful magic, she is so primitive every time she uses it. Why can't you create some basic magic and use physical methods to easily kill enemies? Such as suffocating the opponent in the water. Set fire to burn out the oxygen in the cave and suffocate the enemy to death! It doesn't make sense even if I tell her the principle, it's really annoying! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.