I need to know how to sideboard!

[Randomn]

Im running Affinity at States, and need to know how to sideboard in each of the matches.
My list and Sideboard as reference:
3 Atog
4 Disciple of the Vault
3 Arcboundworker
4 Arcbound Ravanger
4 Frogmite
3 Myr Enforcer
4 Thoughtcast
4 Electrostatic Bolt
4 Chromatic Sphere
4 AEther Vial
3 Crainal Plating
4 Seat of Synod
3 Vault of Whispers
3 Tree of Tales
3 Blinkoth Nexus
2 Glimmervoid
1 City of brass
SB:
3 Viridian Shamen
4 Oxidize
4 Shrapnel Blast
4 Annul

Against affinity I add in:
+3 Viridian Shamen
+4 Oxidize
?+2 Annul?
I take out:
-3 Crainial Plating
-3 Arcbound Worker
-3 Myr Enforcer
Against Any Blue control:
+4 Annul
+4 Shrapnel blast
-4 Bolts
-1 Chromatic Sphere
-3 Arcbound worker
Againts tooth and Nail
-4 Bolts
+4 Blast

Do you guys think this is the right thing to do should I take out different things? or leave tehm the same?

[Baron Sengir]

I think that looks rather good, but what do I know, I'm a scrippa according to BigTymer.

[Baron Sengir]

The least you could do is try it out and see, and change accordingly, but I don't think much will be needed.

[Maraxus of Keld]

Some of the things you sub out against affinity seem a little strange to me (like the Enforcers), but something's gotta come out and I guess it might as well be them. In theory putting Annul in against affinity should be good, so I think you should go ahead and do it, although testing first might be a good idea.

[DontCare]

Well for sbing it depends on what type of deck you are facing.

If it was a mirror match up then when secound round comes along then put all the artifact destruction you can and pray to gos that he doesn't do the same thing to u.

[DontCare]

and also you would konw what decks that are going to be played at the event and what stops the other decks also.