The deck is fairly simple, use Adamancipators to special summon Magnet Warriors and other rock monsters, then use them for synchro summons. Try to get lots of Magnet Warriors in your graveyard, then summon Berserkion and wipe the board.
The extra deck is a toolbox, and it has a wide range of summonable monsters. Synchros can go from level 4 to 8, though levels 5, 7 and 8 are the most achievable. Xyz can go from rank 2 to rank 4, but the main one is rank 3. Link monsters are limited to generic ones, plus Missus Radiant and Aussa.
The main extra deck monsters you want to summon are Naturia Beast, Barkion, Raptite, Quantum Dragon and Gorgonic Guardian.
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