As a commander, he gives you access to Green's suite of +1/+1 counter and fight effects, letting you weaponize his beefy frame while keeping the board in check
Simon, Wild Magic Sorcerer / Mathise, Surge Channeler You want to build around the group hug nature of forcing your opponent's to draw cards before you jump in with Simon, Wild Magic Sorcerer / Mathise, Surge Channeler
Over time, this strategy has evolved, and many similar mechanics have been introduced in Magic: The Gathering
Remember how terrifying he was on the board whenever he came out and generated scary amounts of lore whilst also clearing your board
It can be hard to hold up four mana, but if you sacrifice a large amount of creatures in one go, you can instantly replenish your board
Alternatively, Cosmic Spider-Man is a great new keyword soup commander, with his WUBRG colour identity letting you run Odric, Kathril, Indominus Wreck, and Aurelia all together in a soupy deck for the very first time