Some things happen in game just for fun like this:
There's really no difference in any of the outcomes and after all these years, I'm pretty sure we all know that a blood bat is a myth spell or an evil snowman is an ice spell, but it just wouldn't be the same without that magical swirl of the spell that happens the moment before. It's like you're saying, yes, you waved the wand or wiggled your finger in this pattern and cast the spell that's entered the battle circle. Take it away and it's like taking the pokeball out of Pokemon (unless you're Pikachu and Ash or a wand spell that takes you to the center of the battleboard). :)
And because they exist, they are awesome.