What to do with Low Mana in Soulkeep?

What to do in a level like level 4 where you have low mana in first wave that will make you add two strong towers or 3 medium ones and also in the second wave the gathering mana will not be enough to add more towers and it is likely to allow you to add only one tower.

So you have to choose common ones and this is the only option that will ve available for you in this level ad using cheapo only once will not save you much mana to add more towers and also for Mana Mania which gives you more mana from the killing fiends but as you can see you are in first levels which makes this spell is not enough to help you.

So in League one I think best strategy is common one which you use common towers that use low mana and also common spells which are also good option as I have checked the market and find that other legendary spells and also epic one are triggered by heavy fiends that also are epic or legendary which makes the benefit from them would not be so enough so all you have to do is to use common cards like what I have used below.

Using Cards like Knife Trosser and Gloom Owl and also Card Sharp will be a total of about 180 Mana and this may be like one card of strong tower like Amped Zapper or other cards that is expensive and I admit that it effect is so amazing but one tower of them is not enough as you need a number of towers that could defend more than one way and in levels that you have more than one gate so you have to choose towers according to Mana you have so you could have enough towers in the field and if mana is available you can upgrade them.