The last consideration for double sleeving your cards is accidents
Kill a utility creature early, kill a commander that took some combat damage in the midgame, or throw it at someone's face and draw three once you get your commander down
Two-color combinations Three-color combinations Four-color combinations Five-color combination Why do people use these names, when it takes no longer to say Black-White than it does to say Orzhov
Chainer's ability lets you bring creatures back directly from your graveyard with haste, and your deck is filled with discard outlets that fuel your strategy
Artifacts have a problem similar to that of creatures, in that putting stories on them made them feel more like the receptacles (books and such) than the stories themselves
Once attached, you cant target Cap with other equipment unless you either move the boots to another creature or use your commanders first ability to detach it, which can be handy if Captain America is your only creature