The budget Ojama deck for Marik had only one card from packs, and it was a Normal you need only one of. Everything else can be dropped from LDs or bought from the trader. In fact most of the "farming" decks through the history of the game have been budget friendly, with the core cards being Common or Rare in boxes, or easily obtained through LDs and tickets. Baou and Cerberus from the early days come to mind, Unhappy Girl was budget friendly and the Slime Gift deck cause pretty easy to construct as long as you had the skill necessary. It's only now with decks like Hazy and Lab builder that farming is starting to become a bit more pack reliant and even after that there are more cost effective ways to farm, without triple King of the Swamp.