Is a yugioh deck with 42 cards still good?

Haha dont worry about it. If you have like a Pot of Greed or Graceful Charity, then you're fine. Otherwise, 42 cards will still give you the chance of synchro summoning. If it were like 50 cards, then that would be a different story lol but 42 doesnt make that much of a difference. Good luck! :D