This is close to a standard Praxis Aggro list, but I changed around the numbers and cards to make it as budget friendly as possible.
There are 12 rare cards in the main deck, and 1 rare and 1 legendary in the market. Everything else is common or uncommon.
I've done some very basic playtesting, and it works pretty well. You could drop two of the rares in the main deck (down to 3x each for
East Annex Smuggler and
D'Angolo Houndmaster), and increase the
Warhelm and
Scythe Slash to 4x each, if you want to save a bit more shiftstone.
For the market, you could replace the legendary and the rare with any of these cards:
Mindfire,
Flame Blast,
Sear, or
Edict of Grodov.
10x rares = 8,000 shiftstone, if you don't have any of those. Not exactly cheap, but not super expensive either. And these rares are ones that will always be useful (as long as they don't get nerfed).