Blue also has Wheel of Fortune/Winds of Change/Timetwister type effects that force a swapping of the hand
A Background enchantment thats in your commanders color identity can, of course, be played in a Commander deck just like any other card
And regardless of its many abilities and untapping all your land, it has a massive body and trample, reach, and vigilance to bolster its attacking power
Meanwhile, cards like Boros Charm, Heroic Intervention, Ghostway, Avacyn, Angel of Hope, and Teferis Protection can simply take you out of a bad situation outright
When your cards are sorted, you can build decks without any issues, pull trade options when you need them, and avoid bringing damaged cards to games or meetups
This is especially true for Commander players, who are often guilty of carrying around up to a dozen decks as they head to their Local Game Stores (LGS) or events