Full collections will take effort, especially for serialized or limited cards
Foil Alert Or explore the available sets and find what you need
Commander, at its heart, is a format designed to let us play with so-called pet cardscards that are a little too mana intensive, or inefficient, to run elsewhere
You see, it has you untapping all of your Creatures that attacked this turn, then giving you an extra Combat Phase after the current Main Phase, and then gives you another Main Phase after that
Equip variants or equip abilities with restrictions, like the "equip Citizen" ability of Ceremonial Groundbreaker from the Streets of New Capenna set, are still equip abilities, and their costs will be reduced by Strong Back's second ability
With a tapped Kalamax, you get an extra copy of that spell