How to lose a pretender without even trying

[aldin]

Well, had my Moloch pretender get banished the other night - fun It occurs to me that demonic and undead pretenders are curiously vulnerable, especially when you don't have other undead / demonic units. So now I know of two ways to lose a pretender rapidly:

1) Be undead / demonic without other undead / demons.
2) Take a small number of Astral spheres. (BTW, what's the fewest Astral you'd take with a pretender to feel reasonably safe?)

What other design choices need to be avoided if you don't want to risk your pretender disappearing in a sudden stroke?

~Aldin