The sideboard really depends on where you play. I have my own sideboard designed to beat my meta. There are a few core cards that would probably stay no matter what, but even then. Where I life there is a lot of burn and midrange. Game one if I kept a decent hand and they don't have the nuts it's usually a 50/50. Midrange on the other hand is closer to a 60/40 in my favor. I do prepare for other decks but this is what shapes my sideboard. Also money, not dishing out $40 per
Trinisphere.
2 Relic of Progenitus: For the graveyard shenanigans. Any delve or snapcasters included. Just none of that.
1 Thrun, the Last Troll: Mostly against U/W and U/R control. This card is very debatable, I run this because almost 100% of the time there is someone playing a deck that dies to this.2 Scavenging Ooze: More graveyard hate and good against the other creature match ups trying to aggro you.
2 Obstinate Baloth: Jund is the reason you run this, but it happens to be good against burn. Or any aggro for that matter.
2 Kitchen Finks: Great against aggro. You crank this guy out turn to and stabilize.
2 Ancient Grudge: For that affinity and Lantern Control match up. Also good against decks that use Engineered Explosives. Put in against Tron and Eldrazi tron match ups.
1 Primal Command: I've been trying this card out and I'm not sure. It feels really good to turn 4 gain 7 go find a Obstinate Baloth, but what else? A 5 mana get a creature and bounce a thing? I've seen other people run this and I'm still trying it out.
3 Anger of the Gods: I wish I had 3 Anger, but sadly not one has them for trade around my area. Fantastic against the best deck in modern right now along with any other creature aggro decks.