Leyline of the Guildpact has some utility in Commander too, where cards like The Mana Rig, Fallaji Wayfarer, Hero of Precinct One, and Rienne, Angel of Rebirth might fit together with the Leyline in a Jenson Carthalion, Druid Exile deck
Of the black legendaries in the set, I really love Shadowheart, Dark Justiciar, who is an excellent Commander and card in the 99 of decks with big creatures
15 Jarad, Golgari Lich Lord The Classic Golgari Commander One of the most straightforward commanders on this list, Jarad, Golgari Lich Lord is a commander who wants as many creatures to be in your graveyard as possible
The obvious route may be to increase the amount of useful tools like spot removal, and add trade off massive turns with several spells for ones where I make myself less of a target
Blind Obedience is a staple and can be easily played in every white deck, not to mention that the art is stunning
While they aren't the most expensive Swamp, they are one of the more storied basic lands you can own