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Xanathars power really comes from the ability to just play cards from your opponents library, though

Action cards arent quite as crucial a part of your deck as characters, but you should always look at including them in your deck where you can

Even though Cloud, Ex-SOLDIER offers additional card draw for each equipped creature, it still ends up being far better to just focus on piling everything on Cloud and protecting him rather than spreading it out: you'll kill people faster with commander damage, you'll reap bigger rewards off stuff like Behemoth Sledge gaining you way more life, and it's simply easier to protect a single creature than trying to protect your entire board

Its also potentially good later on in some games too, because some creatures have a high power but low toughness or vice versa