So I went through most of the night playing Arena and I learned a couple things.
- my decks suck xD
- mono red mouse is really crazy

That's the great thing about Arena and exactly what I was hoping to get out of tonight. I was able to become disillusioned with several of my decks, which saves me the bother of getting them irl.

At least, I know I should only bother making a deck irl if it's capable of withstanding a mouse assault in some capacity. This pretty much rules out humans since they are sparse on disruption. If I do build them it would definitely be in a format other than pioneer, unless I do it as a very very casual deck or an art piece of sorts.

Ironically this puts Gruul stompy and Sprite Dragon up a notch because at least they have burn.
It also looks like I was very right about Collective Brutality. Imagine using it to hit both one of their mice and the Monstrous Rage hiding in their hand. I must try this out.

That said, a ban announcement is due in a week, and it's speculated that red is almost definitely going to take a hit.