You want a simple, straightforward deck You want a competitive deck that wins easily and consistently You like the idea Shapeshifting to victory but want something more competitive (play Lazav, the Multifarious) If you're interested in a janky Johnny deck packed with weird, unique interactions not seen anywhere else, then Volrath, the Shapestealer is the commander for you
You can copy both sides of Farm // Market in a Sevinne, the Chronoplasm Commander deck
Cards such as Grim Affliction, Soul Snuffers, and Yawgmoth, Thran Physician all help to spread -1/-1 counters, allowing you to slowly bring the stats down of creatures until they are no longer a threat
What set is Krydle of Baldur's Gate from
While it does go in there, it is much more than that as it also works with non-creature spells