You cant play in official tournaments without sleeves, but there are official sleeves with the same art as card backs
Or it just happens a lot of the black Ninja stuff meshes with the white Samurai stuff to make a cohesive aggro deck
In terms of brand new archetypes, the first one to mention is the Sunvine/Sunavalon archetype from the VRAINS anime, which is a Plant archetype focused on Link Summoning
Out of all the games I played during this deck's lifetime, those three have proven to be the backbone that keeps everything else running
Try to get a Damnation to survive a bad draw, or ideally a Living Death, which is both a way to survive against an aggressive deck and one of the best reanimation effects in the Cube
I feel like they came out of nowhere post- Kaldheim and became a force to be reckoned with in just a year or two