As painful as it is to cut or change themes, here are the cards I think would better suit your commander: Caltrops: A reliable method to trigger your commander when Pyrohemia or Pestilence isn't on the field
That may can be a big deal sometimes
Decks like Dredge and Hogaak have a very difficult time beating Leyline of the Void when it sits in play
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Buy This Card Notes and Rules Information for Garland, Knight of Cornelia // Chaos, the Endless: Each face of a nonmodal double-faced card has its own set of characteristics: name, types, subtypes, abilities, and so on
Until it does, its a good mana rock that lets you cast the things in your hand so that its (close to) empty at midnight
*Select the picture area and draw a preview of your character in the box