I think we talked about this the other day, but Leyline of Sanctity is relevant against Burn, Storm, and Dredge (they can't therapy you). Fair number of sideboard slots though, and a lot to be boarding out each time you want them.

The problem (that I see) is that the best card that bridges both Burn and Storm (Chalice of the Void) is unplayable in this deck. Silence doesn't feel that strong against Burn either, unfortunately.

/edit: actually, the next best card that actually works off of the top of my head actually fits into the recruiter package quite well. One of my favorite pet cards: Children of Korlis. It's pretty insane against any kind of Tendrils deck, and can do some very good work against Burn as well. And in a pinch, can remove Bridges from the yard vs. Dredge too!