Looking for a creature with genetics

[Gaon]

I saw a homebrew creature once that claimed to have a genetic system. I didn't finish reading it though and forgot what it was called. If anybody has any idea what I'm talking about that would be great.

Also, Is there any creature like slivers from M:TG that change with different creatures around. Or that they can meld into a new creature? Sorry for being incoherent. It's pretty late now and I haven't eaten all day.

 

[BOZ]

well, there is krishnath's conversion of the slivers...