Making Cavern of Souls your source of creature spell mana protects you, as when they are cast using this mana, it also blocks them from being countered
Your two actual legendary sorceries are Urza's Ruinous Blast, a board wipe that wont touch your battlefield, and Primevals' Glorious Rebirth, a big reanimation play that might as well have been built specifically for this deck
This ability is a great fit for one of the most popular, and perhaps most unique MTG commanders in Edge of Eternities, however: Ragost, Deft Gastronaut
The downside, is that the poor little Syr Ginger is a fragile 3/1, sounds like someone forgot to chill the dough for a bit before baking
This thing will basically always give you an immediate impact that is powerful and then if it sticks around the game is well and truly over for your opponent 5/5 worth of stats for 4 mana is a great starting point, and the Gutter-Dweller also happens to be able to grow and draw you cards using the expendable bodies he gives you