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Cyber Serpent isn't strictly necessary for the deck but if you own a set I would highly recommend trying it out (replace some of the Barrage/Storm copies) as it can greatly accelerate your early game deck milling and give occasional extra draws

Other than that, a 1 mana haste is also impressive with some of the card combinations you can get with ETB based decks

Assassin's Creed emerges from the shadows to join Magic: The Gathering

Whats Inside: 1 etched foil Tyranitar ex promo card

That you have no personal ability to trigger Shapers Sanctuary means its fairly locked into sideboard only space (metagames could arise that might persuade us to gamble on the card maindeck, but its unlikely)

The Shorikai section also provides the best Artifact ramp options with cards like Etherium Sculptor, the best draw options with cards like Research Thief, and the best Vehicle inclusions with sweet stuff like Imposter Mech