Sakuyamon is the best suited to use Viximon, but top-tier decks like Security Control can take advantage of Viximon's effect through the myriad of Option cards that the deck uses
Kraum, Ludevic's Opuss ability puts pressure on your opponents in two different ways: play more spells each round since the more they hold onto them to play later the more cards you get, OR : hold off on playing more than one spell a turn to keep from giving you any card advantage
Cross Crusader is your primary searcher, you almost always want to go into him first, or at least as soon as you've already set up Malicious in the GY, Wonder Driver is your most important combo piece, and Dread Decimator boosts the ATK of all HERO monsters he points to, including himself, and can deal piercing
My younger brother and I werent helping, as we constantly schemed and pooled our money together to try and buy a few more packs for the both of us