With this list, I'm assuming you are looking to keep your build pretty budget, at least to start. I love Chevill as a commander, I play against a bounty brew like this one regularly. If you are looking to improve your list, take out about 10 of the removal spells you have. Replace every single one of them with either a mana dork like
Llanowar Elves or a mana rock like
Arcane Signet or
Golgari Signet. If your meta is removal heavy or board-wipe heavy, swap those dorks/rocks with land-to-play effects like
Cultivate or
Rampant Growth. Without ramp, you will have a very very hard time playing your higher cost payoff spells like
Grave Betrayal, which make your deck go off for the win.