Trying Common Cards in Soulkeep Battle

I want to try common cards in today battles in soulkeep and as you know it is commonly used by the game in each battle so I want to know how they can do and I also have changed my strategy to face those high waves of fiends in the level four battle which its map below and you can see that you have too many spots to put towers in.

So looking to this map I decided to use common cards not for its power but for its low mana as I used to rent strong towers in the game and in last levels to be able to kill fiends quickly but it do not work in this level so I decided to used more towers and fill the map with towers instead of using one strong tower like Amped Zapper or Quad Killer, I have decided to use two low mana towers.

So I have the towers that were given to me and they are king trosser, Card Sharp and Tarantula Loom and Charnel Pit, I wanted to change Tarantula Loom with Gloom Owl but said I will leave it as it is given to me by the game in default stat.

But for spell I have a little change as I add cheapo to have a disount on Charnel pit which is the most expensive of them, It needs 120 Mana and I want to use three towers in the first wave so cheapo let me add it with less mana and it was a good idea to use more towers as I have passed wave easily and killed bloodlings all of them actually as no one passed.

The problem came when a wave of flying fiends appear and I have charnel pit in their direction which is less effective with flying ones so some of them passed and made me lost some hearts so I have to change positions of towers and also add Gloom Owl instead of Tarantula Loom.