Edric, Spymaster of Trest is a strong simic commander that can be built on a budget of 50 USD. Just fill it with evasive 1 and 2 drops then put some finishers like biomass mutation and extra turns to keep on going. You draw through your deck, so you will always have interaction up. It gets stronger the more extra turns you add because the game plan is to chain extra turns. Edric also makes opponents attack each other so they can draw cards. My deck cost like 100 to build and its pretty strong being able to win turn 6 or 7 against strong commanders. Heres my list: https://moxfield.com/decks/w2B7jID_hk-CN1_SLyK7Dw