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decks used by high-level players in tournaments are built around specific archetypes that make full potential of their unique strengths
Generally, you want to wait to cast your commander until you can start loading it up with Auras and Equipment
If you play with a new group, make sure you know what form of mulligan to use before you finish shuffling up, and after you discuss your favorite ways to count life
If another Machine monster(s) you control is sent to the GY: You can Special Summon 2 Level 4 or lower "Machina" monsters and/or "Commander Covington(s)" (1 each from your hand and Deck), and if you do, this card gains ATK equal to those Summoned monsters' combined original ATK, until the end of the next turn
UV sleeves can also protect the cards from fading, especially for older cards