They start face down in the command zone and can be turned face up any time, which also requires you to say the name of the chosen card
Puresteel Paladin allows you to equip for free as long as you control at least three artifacts, while Crackdown Construct gets +1/+1 until the end of turn whenever you activate an artifact's non-mana ability
Fleshwrither gives you some options-you can transfigure to get Sakashima or Identity Thief, or you can attack with your actual Etrata, shuffle her into your library, and then transfigure to bring Etrata back to the battlefield
In this case, Charizard ex's ability can power up its own attack and leave one extra fire energy to go onto Dragapult
They replicated the scratch for every future card because Magic , like any card game, is dependent on people not knowing what cards you have from the back of them
You might want to Brainstorm in response to put your key combo piece on top so that they cannot discard it