Changes that you can make if you haven't some cards from list
You can change
Fire Conjuring to
Rally or
Relentless Pursuit. Up to you.
Next change you can make swap
Coalscrounger to
Grove Supplier or any board damage buffer, most budget option which i find was this card.
Also you can temporary swap
League Explorer with any 2 drop, but i can recommend
Ornate Katana or
Rakano Outlaw. You can also use
Impatient Pyromage but be cearful with this one because this card doesn't work well with board buffing spells like
Fire Conjuring.
The last thing you can change is add the market cards like Blazing Salvo or Caravan Delivery
Usually remove any 4 copies 2 drop and put 1 copie into market maybe best choice is
Disassembler.
There is a case when you can lose because of lifesteal enemies, so also good options for market are
Factory Quota or more budget option
Ankle Cutter.
Rest cards for market is up to you but if you using
Blazing Salvo make sure that all market cards are 2 mana.
And last thing about spells use them only to finish out your enemie or remove enemy minions don't use them just for pure damage you will just waste them if enemies can heal or even if they have minions which will make some problems by blocking your minions.
Also make sure to change later all cards like in finished build because this is just temporary options if you haven't any shiftstone or cards to make this deck. Most cards in finished deck are just way better options of what i recommend to swap or fits better in this deck.
If you playing fast your average full run time will be 15~20 min
Hope you will enjoy this deck.