Mathmechs are very simple in design and execution, and with some added help can be a force to be reckoned with.
Mathmech 101:
1. Summon yo' Lv.4's
2 (optional). Synchro Summon yo' Lv.8 Magma
3. Synchro Summon yo' Lv.12 Final Sigma
4. Buff the ever-loving Christ out of Final Sigma.
5. Attack over Every Monster in the Game without worrying about card effects.
While Final Sigma is a very powerful card that can only be targeted by Mathmech's card effects, it still needs just a bit added protection to truly be safe in battle. Thus, the inclusion of Mekk-Knight Crusadia Avramax and Links such as Binary Sorceress and Decode Talker are introduced.
Firstly, because of Final Sigma's effect only going off in the EMZ, one would think that including Links would hinder the deck's effectiveness. Not quite; if you play your Links and Synchros in a specific way to take up both EMZs, they can work together quite well. Avramax's job is to fill the first EMZ, and redirect all attacks made towards your monsters-namely Final Sigma, to itself, while being immune to being targeted by card effects. This allows Final Sigma to still be targeted by Mathmech cards while allowing Avramax to take the punishment for Final Sigma. With most to all of these enabled, Final Sigma can safely attack over your opponent's monsters without being targeted by battle (though non-target removal cards such as board/zone wipes will still be an issue).
Another thing to note: Link Disciple and Dugares make a very good combo to accelerate the deck. Since Mathmechs are primarily Lv.4s that have great effects in searching each other out, getting Dugares linked with Link Disciple can be extremely beneficial for not only draw support (Dugares draw 2; discard 1, then tribute it to activate Disciple's effect and draw 1, send one to bottom of deck). Also, Link Disciple and Decode Talker are the best for summoning Avramax-no joke.
In summary, Mathmech by itself is very strong, but with added help from Cyberse Links can be turned into a near-unstoppable OTK deck with fantastic draw support.
Addendum: C.O.D.E. stands for:
Cybernetic
Over
Drive
Executable
...god that's so cheesy, lol.
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