I would say the risk of running low cost spells isn’t that bad with primordial since as long as you have higher cost spells undrawn there is no way for it to hit a low cost spell and even if you ran out high cost spells it will at least do something
If you want to use the Fist of Ra-den then that’s where those low cost spells will hurt you the most. 1 cost legendaries suck to summon lol
Getting rid of the lost cost spells though will make marsh spawn unreliable
All I play is home brew and I work hard in crafting them so they can still somewhat compete with the net decks we have now. Honestly your best bet is to just play the deck as is and you’ll spot all the flaws your deck has. You should be constantly refining them until you are satisfied with what it can do which can be time consuming but it sure is rewarding when you your able to climb with it and you’ll get better overall
Remember to build around the idea the card you build around gets countered, you have some sort of back up in its place and you seem to have that already as your trying to win through board alone with the possibility of getting big minions with a really good effects
How are you fairing against aggro?