Magical Abilities-Attacks
OK! Yuuno isn't a really heavy hitter magically, for his canon anyway. Still, the boy has a few options.
Attacks
Suck. No seriously. They're about as dangerous as throwing a styrofoam ball. They also seem to take about as much energy as running up a hill small mountain, with a full pack.
He shows ONE attack 'Forbiden Jewel Seed Seal' or words to that effect it the first episode. It, um, doesn't work and he passes out while turning into a ferret.
I figure Yuuno knows how to create other magical attacks and can teach them. He just doesn' have the oomphf, even at his best, to use the suckers.