Protection from everything protects you from damage coming from any source, even those that arent targeted, like Earthquake
Magic: The Gathering s new Marvel Super Heroes set is here, and as you can probably imagine, its absolutely packed with legendary creatures you can use as a Commander and build a deck around
Technically all cards that are not Pendulum nor Link Monsters are legal
This gives you the flexibility to use points in the way that makes the most sense for you
There are some powerful synergy pieces you get access to in blue, like Titan of Littjara, Skystrike Officer, and Tobias, Doomed Conqueror, but I dont think this is the best build of soldier typal in Commander
Having a reward for taking out other players permanents makes players a little more aggressive with their removal, which can help prevent any single players board state from getting out of hand