Hmm, alright, I'll see if I can represent my thinking process properly
5
![Air :air](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/air18x18.png)
5|4 + flexible ability Thunderbird (it can do a lot of things with its ability xD), it will get flight as well
4
![Air :air](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/air18x18.png)
3|3 + fix ability Dive (dmg) Wyrm
3
![Air :air](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/air18x18.png)
3:2 + fix ability of mana generation Firefly
10
![Air :air](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/air18x18.png)
9|6 Azure Dragon
The higher end creatures seems to be Cost - 1 for their ATK, maybe that's the thing that's throwing me off xD
When compared to other elements, the thunderbird seems a bit more cost efficient on the damage per turn, survivability and flexibility of its ability. I wouldn't say it is absolutely OP, but it would definitely become a favoured contender. Abdomination at 5
![Entropy :entropy](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/entropy18x18.png)
, Flesh Spider at 3
![Death :death](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/death18x18.png)
3:3, Graviton Mercenary at 4
![Gravity :gravity](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/gravity18x18.png)
3|5, Blue Crawler at 3
![Water :water](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/water18x18.png)
, 3|3, etc..... seems less desirable in comparison.