I never even heard of Miracle Rogue until a few weeks ago, and yeah that deck is pretty much dead and I won't be able to afford it so maybe I'll switch over to Pally or Warrior Control, at least make janky versions until I can craft key cards, but really at this point my real plan is to craft key neutral cards that'll fit in most decks, this lets me take care of dailies which fuels more cards
If you are aiming to go cheaper, you're headed in the wrong direction. Control decks use cards at 7+ mana as their win condition, and pretty much all the playable cards at that mana cost are legendaries. And Control Warrior is probably the most expensive deck in the meta.
By the very nature of the beast, the cheapest decks are those that have the lowest mana curve.