Commander deck techs, Standard / Modern / Pioneer / Pauper builds, sideboards, mana bases.
A legal Riftbound deck is four separate stacks, and three of them are not the 40 cards you spent all your time on. Here is deck construction straight out of Riot's Core Rules and Tournament Rules, the rune math that decides your curve, the six mistakes new builders make, and how to upgrade a Showdown Deck without making it illegal.
