Those weird creatures at MD/Player auction, which one should I buy if I don't know what it is? Everyone talks about Angiens, Drachorns, Trees, Popes!  How (where) can I find descriptions and abilities of the generally known creatures?  What about more unique ones?

Info about recruitable creatures can be found at their recruitment facilities.

As for unique / rare creatures, most informations are hidden from the public. However they might be obtained by asking someone who owns said creatures.

Spoiler

 

A key difference between MD and many other games is the attitude towards so called "spoilers".

Most of the games have a "pay-to-win" approach, they provide you the complete catalogue because you can buy everything since the very beginning.

In MD you don't buy your way to the top, you earn most of the stuff, informations included.