[ano]

MA Pythium, like MA Man obviously needs two things from a bless. First is regeneration for old archtheurgs (those diseased ones may be sent to battle and have a very long life healing using the bless regeneration or just being given Shroud of the Battle Saint and left home), second is reinvigoration for sacred battlemages and communicants. Second is not necessary but very good. So, I think that a very good pretender for them would be a dormant combat pretender with N4E4, probably the Earth Mother. This build as well as in the case with MA Man aims several targets at once: decent combat pretender, good bless suiting the needs and access to earth and nature.
I don't like the idea of forging clams with pretender without a forge bonus. It is just not worth the price, especially comparing to the benefits you can get otherwise.