Sorcery, 2GG (4) As an additional cost to play Natural Order, sacrifice a green creature. Search your library for a green creature card and put it into play. Then shuffle your library.1 ... but the price of Mangara's freedom was Asmira's life.
Illus. Terese Nielsen
The sacrifice of a green creature is part of the play cost and is paid on announcement. You do not have a choice to pay this cost zero times or more than one time in order to multiply the effect. [D'Angelo 1997/01/28]
You do not have to find a green creature card if you do not want to. See Rule G19.4. [D'Angelo 2001/07/14]