I would say around 50 people and no, Fifth Dawn will not be legal.

I just found out today that later this summer this is going to be a Type 1 tournament for an Ancestrall Recall allowing 13 proxies near my home town. My question is, since my local metagame is almost completely unpowered and far from normal, what decks should I expect if everybody can proxy power?

Without knowing what anybody is playing I was thinking about playing U/G Madness because I feel comfortable playing it and it allows me to maindeck Null Rods which should be good if everybody is proxying Moxes.

Any thoughts on what decks I could expect to see in large numbers would be greatly appreciated.

Have you ever thought about using Troll Ascetic or would that be too expensive of a threat?