Alice and Nicholas each control five Elvish Mystics. Each graveyard has a Canker Abomination and nothing else. Alice casts and resolves Exhume. 

How many Canker Abominations remain on the battlefield after state-based actions are checked?

More generally, what happens when multiple permanents with "as [this object] enters the battlefield" effects enter at the same time, specifically when the act of entering would change the board state in a way the effect cares about?


Question: Does every specialization of Craft you take get the class skill bonus, or just the first?
Answer: Yes.

Craft is actually a number of separate skills. So if you have the class bonus for craft you have it for all the skills in the craft "family".