One exception to note is Uncommon cards, which are represented by the rarity symbol of an open book - the logic being that an open book has two sides, or pages
Thats not to say youll copy their decks exactly, but they can be fantastic for getting ideas
Cloudstone Curio is the first of those cards
I'll use Muldrotha, the Gravetide as a deckbuilding example on figuring out the ratio of lands and ramp: Lands For figuring our lands, the two questions you need to ask yourself is: What's the average cmc of my spells
Each deck introduces 20 never-before-seen Commander cards to Magic: The Gathering
That being said, reanimating Legate Lanius, Caesars Ace can get pretty oppressive, especially in a deck full of edict creatures