Adding several blend color nodes in maya is this possible tia sal2

Greets All

I have 18 different textures for the same object and I would like to
animate the object 
when it extrudes.  The texture should change when the object extrudes at a
certain level.  
Can I have this many blend nodes?  
I only see that I can plug in two colors or textures can I increase this
to 18 some how?  

tia sal2