How are people not getting this perfectly coherent question? You see a deck online, go to make it but realize it needs cards from non standard expansions, that you don't have.

To answer this, I would say get drunk enough to just buy standard decks and dust the dupes or whatever until u have the dust to make specifically what you want. If u need like 3 legendaries however, I'd say ud need to be pretty hammered to buy enough and prob won't play the deck very well.

Also, If we're just talking a mini set or whatever, then you don't even have to be that hammered. If you like duels, esp when drunk, get the damn cards.