Oh man, now that I think of it Isochron Scepter + Dramatic Reversal gives your whole team infinite power and toughness via your Commander, as well as giving you infinite Mana if you have enough Rocks on the field
An "A" box of Legends only had the uncommons from group A
Like Pokmon Card 151 [SV2a], Pokmon Go was first launched with just the Gen 1 Pokmon
This means that Blessing of Leeches grants your Commander a ton of flexibility, letting it survive Damnations, Doom Blades, and difficult blocks alike
I think sideboards are essential in any game mode, Arena or otherwise, and getting to play cards as they were designed is common sense to me
If youre not, it still gives you a logical system thats easy to maintain and easy to search