Honestly, you got waay too much stuff going on there. For a Scarab to be of any use, you need to have played 3 cards (Scarab, Plate Armor, Gravity Pillar). You're gonna have a lot of trouble getting that to consistently happen early enough for it to make any difference in a game. So how about you scrap the Scarabs and Plate Armors.
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Now we have another 3 card combo going on here still. To be able to use a Scorpion, you have to play a Scorpion, Gravity Pillar, and Momentum. How about we cut out the Gravity Pillars and play with a Gravity Mark.
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Now, we have both Graboids and Scorpions here. If you want consistency, I'd say pick one or the other. Go for a Time/Gravity deck with Scorpions and Momentum or go for an Earth/Time deck with Graboids, EQ, and RT. If you really, really want to go trio, then you're gonna have to work your deck even more. Let's focus the deck on the Scorpions with extra pressure from the Graboids. So we're gonna increase the number of Scorpions and Momentum to make sure we put the poison pressure on early. This also makes sure our Mark isn't wasted. And for now, we're gonna chuck everything else that doesn't help get those two main strategies going.
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With this deck, you have a 53% chance of getting 2 or more Earth Pillars and a 62% chance of getting 2 or more Time Pillars in your opening 7-card hand. This puts you at playing a Scorpion and Graboid on turn 3 which is perfect since you can't play a Momentum till turn 3 anyways. So this is the baseline deck. If you want to add other cards, you definitely need more pillars and those Hourglasses back in. Just know that even though you may be able to handle more situations with those shields and weapons, overall, your main strategy of getting Momentum'd Scorpions and Graboids on the table will be slowed down.
Hope that made sense and helped.