There are definitely a few good reasons for this wavy blade. One of them is that a curvy blade will hit the target better that a regular straight one. The other is that it has more edge surface therefore the blade will be even more efficient in combat. The third is during sword lashing your opponent will have a much harder time trying to slide their sword from yours and so you will have more opportunity for a close attack. And the last reason is that it simply looks very cool and is an original choice of weapon.