Youll be looking either for a commander that cares about hitting your opponent like Anowon, the Ruin Thief, or something that makes it likely that youll get to hit the opponent with multiple creatures like Oona, Queen of the Fae
I would use all 9 GMX cards in the side deck, along with the extra deck bricks, which are Bishbaalkin, Number 33: Chronomaly Machu Mech and Puzzlomino, the Drop-n-Deleter, and put the 12 tech cards from the side deck in the main deck
And youve witnessed Schemes that may or may not have been Terrors of greater perils
Others Snake-Eye, Azamina, Fiendsmith, Millennium
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Also Shuriken while being fun to play in a ninja deck isn't that great, you already have other removal in Doom Blade