http://www.wizards.com/Magic/Magazine/Article.aspx?x=mtg/daily/rc/234
Sideboarding
But what about that sideboard? Well, let me break it down!
Centaur HealerAgainst beatdown decksespecially Mono-Red and ZombiesCentaur Healer brings your total of lifegain creatures up to a comfortable number. Although they will have Skullcrack, it's a lot easier for them to leave two mana up for a Skullcrack when you're about to cast Thragtusk than it is when you're casting an early-game Centaur Healer.
Rest in PeaceAlthough this deck is overall strong, it has few answers to the Reanimator decks. Those decks will run all over this one. While I dislike how poor Rest in Peace is if you draw multiples, you need it so badly against those decks that I'm willing to run the full four copies.
Boros CharmThe control decks are going to lean on Supreme Verdict against you, and if you can establish a board presence and then leave mana up for Boros Charm they're going to be out of their primary weapon against your blisteringly quick starts.
While I dislike bringing in more spells in a deck where Domri is at his prime, you're cutting Bonfires for these so you're only actually going up by one spell.
Knight of GloryThese are just a creature that's strong against Zombies and black-centric control decks. You could also consider Pillar of Flame instead, depending on how many red removal spells and Devour Fleshes you expect Zombies to play.
ThragtuskThis just fills out the set against beatdown and midrange. I don't think you want the fourth copy against control: I would rather have Thundermaw Hellkite most of the time, and, especially after bringing in Boros Charm, which you want to hold two mana up for, you can't afford to have too many five-drops.
Bonfire of the DamnedLike Thragtusk, this adds a third one into your deck against beatdown and midrange decks. It just makes it that much more likely you'll find one. (Although hopefully not in your opening hand.)
How would I sideboard exactly? Well, this is how I would traditionally sideboardalthough depending on the matchup you can switch it up in different ways. For example, in beatdown I don't say to sideboard in Knight of Glory, but if you're playing against Zombies you definitely want to be playing some.
Versus Beatdown (Like Mono-Red and Gruul)
-2 Domri Rade, -4 Thundermaw Hellkite+1 Bonfire of the Damned, +1 Thragtusk, +4 Centaur Healer
Versus Other Midrange Decks (Like Jund and Naya)
-2 Strangleroot Geist+1 Bonfire of the Damned, +1 Thragtusk
Versus Control (Like Bant Control and Esper Control)
-1 Thragtusk, -2 Bonfire of the Damned+3 Boros Charm
Versus Unburial Rites Reanimator Decks
-2 Bonfire of the Damned, -2 Strangleroot Geist+4 Rest in Peace
