Serpherior is in all likelihood going to get banned very very quickly once it drops unless a lot of other ludacrous stuff also drops. It's very close to espartha - a fast snowbally mon that is nearly unstoppable if it gets to cheat turns. Which tera enables. That can also run multiple sets viable on their own merits - sub seed and sub glare. It's probably not going to invalidate webs for long. It's only major difference between it and espartha is that unlike espartha it doesn't eventually outspeed all scarf mons, but it does get a lot more mind games with sub/seed/glare.