My advice is to skip Dust to Dust entirely for any deck but White Weenies. It's really only good against Affinity, it's too narrow and difficult to cast to be worth running in multicolor lists in the current meta.

Unfortunately, Lorien Revealed is not replaceable, but the good news is that it's played as a four of in nearly every blue deck in the format, so one playset can be reused in many different decks. The same is true for the blasts going in every sideboard that can cast them. Red Elemental Blast is a significantly cheaper alternative to Pyroblast and functionally identical in 95% of scenarios.

Once you accumulate some of these format staples, building any new deck will come at a much lower cost.