If you cast Meteor spell four times in quick succession they do not overwrite each other, but for some reason Ice Snake does. I noticed however that when you play Arcanist Chaos explosion lets you cast multiple Ice Snakes and none of them disappear until they reach maximum range. But if you have 4 ice snakes simultaneously going out from you, casting an ice snake spell yourself gets rid of all of them at the same time.
We already have the groundwork for being able to cast multiple snakes with Chaos Explosion, I feel like that should just be the vanilla mechanic instead of something specific to Arcanist



