Goblins: Preboard, combo as quickly as you can. Postboard, you bring in the man plan and stomp them.
Elves: Counterbalance is really good, and will let you play control until you combo them out. Games 2 and 3 are similar, but you need to watch out for Krosan Grip and/or Choke.
Thresh: Again, Counterbalance is really good. Take control of the game and eventually combo out. Postboard the combo comes out for the man plan.
ANT: Counterbalance. Combo. Repeat ad nauseam (lol see what i did there?).
Ichorid: You probably lose this one unless you get the turn 3 win or can disrupt them heavily via Thoughtseize/Force. Postboard isn't much better, but you get Crypts to slow them down.
Faeries: Is that actually a deck?
Dragon Stompy: Your combo is entirely colorless, so while Moon effects may shut down the rest of your deck, they won't prevent you from winning. Chalice, on the other hand, is a problem. Postboard, you have Grip and Explosives, which help somewhat.
Afownity: I haven't played against Afownity, but I would imagine that you just want to assemble the combo quickly, avoiding countermagic via Thoughtseize/Force. Grips seem like they'd be pretty good postboard. I'm not sure whether I would side out the combo or not, but I'd probably bring in the Goyfs.