My Formation for Card Sharp Map in Soulkeep

I want to try a new formation today with a good towers and this is in level 4 which is in league 1 and in the sharp defense map which by the way is not easy at all and this is for first waves as there is a huge amount of fiends that came in the second level and when you have only some towers in a way but they came from a second way.

So I want to try a some common towers and also spells to try them in this level to see what I they could do as I have chosen them for their low mana as in this level the only problem is the mana as you have to save as much mana as you could so you could add more than a tower to be able to pass the wave after wave and to pass this level.

I have chosen 4 towers and they are knife trosser and this one is fast and cheap as it could be used with 55 Mana and also Card sharp as it could be used with 70 Mana and Charnel pit as it could be used with 120 mana and it is relatively high compared to other towers but it is superfast that would help with fast fiends like bloodlings and this is why I have chosen it and also it could attack with area.

Last tower I have used is Slime Lord which is a fantastic tower that I have used and this one not for attacking as it is a strategic tower to slow down fiends to make it for other towers to attack fiends and this can be used with 85 mana and last thing is spells I have used a cheap spell which is stew of doom and also Knasas Twist that also for a purpose of slowing like Slime lord.