
Prerequisite: Yaun-Ti Druid
You can only wildshape into snake beasts.
You can wildshape into any snake beast regardless of other restrictions.
You can still cast spells when in a snake beast form.
Whenever you use a spell that would summon beasts, you can only summon snake beasts.

this would be great if not for some snake like beast such as medusa, basalisks, and some demons likely making it too imbalanced for most DMs to allow
The 'Beast' monster type is the implied intent there.
fair enough, though dosnt really expand much as there are very few snake beasts currently last I checked, most snake creatures are monstrosities