Cool thanks for the advice people, to clarify I think some of you got it, but to clarify,
A Dry Wing gets +1/+1 for every poison, but the poison still hurts it, in other words, its HP never actually rises, it stays at 1hp.
Anyways I see that this would absolutely destroy an Airborne heavy deck such as mono-air, so I'll work on some way to prevent that.
**EDIT**
OK so I've updated the cards. Now Featherless gives all airborne creatures on the field the passive ability featherless. Dry Wings now are now available as a separate card.