Mathmech Processor Final Sigma is a synchro lv12 which can be summoned via malefic engine (surprsingly, it's the only lv12 synchro target for malefic archetype).
First step is to aim for the cards like malefic cyber-end dragon on hand and parallel gear on field. To acompolish this, you can use paradox gear effect. Paradox gear is easily searched/summoned by cards like: malefic world, malefic selector (read its condition first), one for one, where arf thou (using sky striker token as condition), and platinum gadget (summoned using sky striker engine).
As a secondary strategy, this deck can use basic malefic beat-up. So, you need field spell to acommodate that. Field besides malefic world, like sky striker area zero (searchable with engage) and trickstar lighstage (searchable with candina, good for going 2nd) are recommended. Malefic territory is a must, as it can search malefic world and disable ur malefc monsters downside effect. Also dont forget terraforming and set rotation.
Aside for summoning platinum gadget, the sky striker engine can be used to break board too. The rest of the main deck are just handtraps or cards used to break board (monster and/or backrow). The cards listed are just example and the ratio is up to you. You can use any break board cards based on matchup/your likings.
Extra deck: mathmech processor final sigma, cyber end dragon, stardust dragon, platinum gadget, hayate, kagari, shizuku, malefic paradox dragon (lv10 synchro), dragocytos nethersoul (big body, another lv10 synchro target for parallel gear+stardust), and the rest are generics with big body or to break board.
PS: some cards are not available on tcg yet (example malefic selector)
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