While the Dialga pack should be your priority, integrating cards from both sets ensures a more complete and optimized deck for competitive play
I've engaged with the subreddit and various Discords to source information and have found every interaction to be pleasant
This means that the Background can have a different color identity from the legendary creature and you use the combined color identity of both the legendary creature card and the legendary Background card to determine what the other 98 cards in your Commander deck (or 58 cards in Commander draft) can be
Corviknight 151/202 is a Uncommon card and belongs to Uncommon cards of Sword & Shield series
If you want to learn more about the Qualifier Play-In events, the three-times-a-year Arena Championship and its $200,000 prize pool, or how you can qualify for a designated Pro Tour through digital play, you can and read the announcement article in full
More importantly, Seize the Storm (and the similar Serpentine Curve) are likely to create even bigger creatures for the decks that want these kinds of spells