I'm sure I'm going to make a flaw somewhere in this post, but I'll try to explain anyways.
Assuming that there are 4 SoF and 4 air creatures on the field:
4 SoF's cost: 4
![Air :air](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/air18x18.png)
Its effects:
50% damage increase: Skyblitz has 8
![Air :air](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/air18x18.png)
cost, and since SoF does 50% additional damage, let's say it's comparative cost is 4
![Air :air](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/air18x18.png)
. There is a downside that 4 SoFs are needed, which cost 4 cards in the deck, but since it can be used every turn instead of just once, I'll ignore that.
Ignore shield: 4 Momentums cost 4
![Gravity :gravity](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/gravity18x18.png)
, so let's say the comparative cost is 4
![Air :air](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/air18x18.png)
.
Evade targeting if
![Air :air](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/air18x18.png)
: Fairly difficult to compare against anything, but quintessence does have a cost of 4
![Aether :aether](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/aether18x18.png)
per creature, with a total of 16
![Aether :aether](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/aether18x18.png)
. However, decreasing the comparative cost is necessary due to the fact that air creatures can still be targeted with mass CC, and that SoF is prone to PC. Let's say a cost of 4
![Air :air](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/air18x18.png)
total.
So 4 SoF's effects have a total comparative cost of 12
![Air :air](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/air18x18.png)
, and therefore 3
![Air :air](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/air18x18.png)
per card. I assume I may have forgotten a few things, but even so, 1
![Air :air](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/air18x18.png)
seems too cheap.