First, let’s start with the most impactful new cards.
I like Valki a lot more in Historic than I like him in Standard. Getting to exile your opponent’s Uro and immediately transforming into it is obviously a big part of it, but it’s mostly the fact that in Standard, everyone plays a lot of removal because everything mostly revolves around creatures. Bonecrusher Giant is everywhere and Rogues and all the control decks play a ton of removal as well. For that reason, Valki is quite unreliable thanks to the fragile body.
In Historic though, it’s a different story. Sure, there are decks like Jund Company that’ll always find a way to get rid of it, but there are also a ton of combo decks and decks that only really care about their own game plan, without really disrupting you, which is where Valki is a lot better.
This land should greatly improve the mana base of Azorius Auras and could possibly find it’s way into Azorius Control as well, though that deck already has an extremely solid mana base.
Similarly, this is a huge improvement for the mana base of Rakdos Arcanist and Rakdos Sacrifice, both of which really needed it.
That’s pretty much the end of the list. Sure, there are some other playable cards like Birgi, God of Storytelling, Cosima, God of the Voyage, Faceless Haven, Weathered Runestone, Showdown of the Skalds, Immersturm Predator, Old-Growth Troll and potential sleepers like Pyre of Heroes, Harald, King of Skemfar, Vorinclex, Monstrous Raider or Moritte of the Frost, but there hasn’t really been much Historic action since the Kaldheim release, so we’ll need to wait a little bit longer to see if they have any real impact on the format.
That said, the Power Rankings didn’t really change since the last time. Rakdos Arcanist is the deck that got the biggest boost thanks to Blightstep Pathway and Valki, but that’s about it. There isn’t anything as crazy as what’s being seen in Modern where everyone is now cascading into Tibalt with Violent Outburst and Ardent Plea or using Tibalt’s Trickery to cast an Emrakul, the Aeons Torn on turn two.
If you’re playing a serious tournament, I strongly recommend playing Jund Sacrifice, Gruul or Sultai. If you’re playing on the Arena ladder, then you can expect a lot more aggressive metagame, which means that you can do well with decks that are generally good against creatures.
It seems like the decks that got the most help from Kaldheim are all creature decks, which is good news for Sacrifice. The more creature decks in the format, the better for you thanks to cards like Claim the Firstborn and Priest of Forgotten Gods. Both Valki and the Pathway are probably going to find their ways into this deck as well.
This deck has been getting probably the most action since Kaldheim got released and it’ll be interesting to see if Valki and Blightstep Pathway will actually take it over the top and put it in the Tier 1 of the format.
3. Gruul Aggro
If you like attacking, but still want to play some high impact powerful cards like Collected Company and Embercleave, then Gruul is the deck you’re looking for. The creatures are just all so much bigger and better than other non-synergy creature decks.
4. Sultai Ramp
Sultai is still the most solid deck with the best cards in the format, you’ll just need to wait a little bit to see what the new metagame looks like to be able to properly tune it to beat it.
5. Orzhov Auras
I wouldn’t dare bring this deck to a tournament because it has a terrible matchup against the sacrifice decks that are currently the most popular and best positioned, but it’s been having excellent results on the Arena ladder against all the other aggressive decks.
Another deck that got a solid boost from Kaldheim, both Valki and Blightstep Pathway should be decent improvements.
As usual, you can’t really go wrong with Goblins, although the other top decks are just a little bit better.
Azorius Auras is a solid choice for the Arena ladder thanks to the aggressive metagame, but it has same issues as the Orzhov build; it’s just too bad against the sacrifice strategies and Sultai.