To give a foundation to it
Other than merfolk kindred decks, Deeproot Historian might be worth a look as a way to ignore commander tax for any deck with a druid in the Command Zone: Faldorn, Rashmi, Chulane, Kinnan and Tatyova are good homes, just to name a few
One effect targets a specific creature type and the other targets not-that-creature-type
A lot of popular commanders have unique abilities that players build around, turning them into combo pieces or creating a deck that relies on having them in play
Solitude lets you tap out for a Teferi, Time Raveler on turn three without having to worry about your opponent attacking it
But Red/White wants to attack, using Equipment and combat abilities - such as Giott, King of the Dwarves double strike - to make it very difficult for your opponent to block