And restricted to non- airborne
Hmmm... restrict to non-airborne is typically more of an

mechanism. Although the restriction is not bad.
I definitely think some kind of skill cost bump is needed, or some other balancing mechanism.
... One interesting idea: Snakes need to recoil after striking, so what if you made it delay the snake for 2 turns when used? (i.e. prevent it from being used in consecutive turns)