Sideboarding Guide:

This is fairly similar to my Rakdos version of this list concept. Just going to go through what's in the sideboard and when you'll want to bring it in.

Blacklance Paragon: This is good against decks with Big Green things, since it can kill Questing Beast or Lovestruck beast. Also good against flash, since it gives you an instant-speed way of blocking and killing a Brineborn Cutthroat or Ambusher. (and in the case of Ambusher, if he counters it or uses removal, he doesn't get his free wolf, AND has less mana to stop you from killing it on your turn)

Epic Downfall: Mostly for Wicked Wolf. Also good against Fires decks, since it can remove Cavaliers without allowing their on-death triggers.

Noxious Grasp: Should be self-explanatory. lol. Note that it's also good against Jeskai Fires, as it lets you kill Teferi and Kenrith.

Embereth Shieldbreaker: Jund Cats. (duh) Well, any cat deck, really. They're a lot less worrisome without ovens. Edge case use against some of the Dance decks, since removing an artifact can force them to lose their Doom Fortold. Also edge case use against Henge decks, though bedevil is probably the better choice.

Thought Erasure: Control decks, Fires decks, combo decks, etc. Basically any matchup where it's more important that things never hit the table than removing them once they get there. (especially enchantments)

Bedevil: Other Embercleave decks, since you can nuke the embercleave itself. Also good against decks like Fires, where smaller removal, like from Giant, isn't really all that useful. Also not bad against Cat decks, since it can serve double duty killing ovens and critters.

Bolas: Bring him in against hard control and probably fires, as it gives your deck an unexpected threat axis. After game 1, those decks are going to bring in their AOE and creature removal, and probably will have a much harder time dealing with a resolved Bolas. Bolas can also remove big things and opposing walkers.

Things to take Out:

On the draw against anything midrange or faster: Robber. Any deck that empties its hand relatively quickly means robbers are very unlikely to get to steal cards when you're on the draw, which makes them significantly worse. 

Against Fires: Crusader *must* go out. You're shooting yourself in the foot if you let Fires draw more cards. Depending on their secondary cards, can remove some of the giants, as there's really not that many good targets for the nuke, and they die to Clarion.

Against decks with *lots* of removal: Ebon Knight. Yes, it's a great card, but it depends on it and other creatures staying on the board for an extended length of time in order to build up a lot. Since that's unlikely to happen in these matchups, these can be dropped in favor of cards better against that specific deck.

Against super-fast aggro: Some number of Spawns and crusaders. Self damage against decks that are faster than you is risky at best. For the same reason, giving them ore cards is pretty hazardous. How many of each get removed will have to be a judgment call, as crusaders can eat removal and block, and spawn are at least somewhat hard for decks like RDW to get past. Not THAT hard, though.

Hard to give more hard & fast rules for stuff to take out, since there's so many possible variants of decks you can run into.