I think it's hard to encompass massive ideologies into something like this without seeming reductive. Communism might have rules and be ruthless, but it's also

I think it's hard to encompass massive ideologies into something like this without seeming reductive. Communism might have rules and be ruthless, but it's also a utopian ideology that motivated heavily by a desire for "freedom" in its anarchist framing. It's just that this state of freedom is deferred (basically indefinitely). There is also a huge element of technocratic management in socialist economics. I would actually categorize it as a Blue/Red ideology with splashes of Black once the tankies show up. These are Grixis colors, but Grixis in magic is predominantly Black with a bit of Blue and Red, while Communists would be predominantly Blue/Red with a splash of Black. Nazism is must more White rather than Blue. It's a preference for order, hierarchy, and purity, which are all classically White. It's also violent and ruthless, which is classically Black. There is also some Green in there because of the emphasis on a belief in primordial racial groups having a "natural" hierarchy. Their idea of nature is completely at odds with how nature actually works, but they think that's how it works. They're pretty close to Abzan (https://mtg.gamepedia.com/Abzan_Houses https://mtg.gamepedia.com/Abzan_Houses) with the general militarism, the xenophobia, and the obsessive focus on lineage.