Sulfefnir is the best crystron card in the deck, because not only summon itself from hand and gy by discarding 1 crystron card from your hand but after that you have to destroy 1 of your cards, then if you destroy itself you can summon 1 crystron from the deck.
Rosenix is fine because it help get Martial Metal Marcher on the field to get more tuners, but also ust help with getting that extra level needed on the field.
Thystvern is your monster search so not more to say that it's a must at 3 copies.
Smiger problably as the worst effect and that's why I use 3 of it. You want your other crystrons in the gy to use their effects so Smiger can use it's on field effect to get a tuner and maybe get your crystrons from the field in to the gy as well.
Prasiortle summon your crystrons from your hand so like Thystvern it 3 is a must.
Rion, Citree and Quan summon can all summon a monster from different places on your opponents turn and synchro summon 1 machine synchro monster. Rion summons from banished, Citree summons from gy and Quan summons from hand. They can all be summoned with the first effect of your non-tuner crystrons.
Impact is the only crystron trap I use. If you set it you can summon 1 banished crystron monsters and your opponents monsters get 0 in defense. If you have it in your hand you can also send it to the gy with Sulfefnirs first effect.
Scrap Golem is a granet but that's why I like having 2 of them so if get 1 in my starting hand the combo isn't dead.
Scrap Raptor is here for the consistency so it's like you have 6 Scrap Recycler in the deck.
Scrap Recycler is the key card to you're scrap combo, but also it's first effect isn't a once per turn you get to send a machine each time it's summoned.
Cartorhyn the Hidden Gem of the Seafront not only gives you an extra normal summon for a water and earth monster, but can also special summon itself from the gy if you control a water and earth monster. Remenber it's effect says (You can only gain this effect once per turn), this means you can only normal summon once if you want to activate it's effect.
Transmodify can both help get a crystron the gy and get another on the field so you don't have to use their effects.
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