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
Also Shuriken while being fun to play in a ninja deck isn't that great, you already have other removal in Doom Blade
Others Snake-Eye, Azamina, Fiendsmith, Millennium
x2] [When Attacking] You may trash 1 card from your hand: K type and your opponent has 3 or more Life cards, K type Leader gains [Banish] during this turn
"Pot of Acquisitiveness", Spell & Trap removal (preferably Quick-Play, such as "Mystical Space Typhoon"), and "Imperial Iron Wall" can deal with these cards, however