Hello,
yes Rug Delver is a even matchup i feel. The matchups i mostly had problems with is merfolk, tin fins and elves. Especially tin fins is a deck i don't have an answer for... except of Mindbreak Trap. I also thought of putting 4 surgical extraction in maindeck since cards like Wasteland and FoW are such a mess vs 12post. Your thoughts on SE?

Edit: Also i would like some links to coverage of 12Post since i hardly find some myself. I watched some Murata, Rudolph and that guy in providence games but otherwise I can't find.