Horse
In A Piece of Straw, a Horse shows up in a man's trading quest that gradually leads him towards a better life. Dead, the Horse was worth a massive amount of silk. Once the Horse was brought back to life, it was worth a large patty field.
A Horse was also mentioned in Go Zu-Mong, King of Goguryŏ, but it is only mentioned as a means of transportation for a king.
Traits
Costly
Tool