Fortunes and Winds (2002) for Legend of the Five Rings, Second Edition and Dungeons and Dragons, Third Edition presents the new race Shapeshifter, each subrace of which gains a handful of Spirit Points with which to buy Spirit Abilities. However, no Spirit Point cost is provided for the the Spirit Ability Shapeshift: Spirit (Fortunes and Winds 24).
Given the Spirit Ability's power (that is, Shapeshift: Spirit allows any level 17 or higher Shapeshifter to use a polymorph-like effect to change form for 1 hour/level into a specific extraplanar being of the creature's Hit Dice or less and employ that being's supernatural abilities), I expect the cost to be prohibitive. Is there errata for Fortunes and Winds that gives this Spirit Ability a Spirit Point cost, and, if there isn't, what is a reasonable Spirit Point cost for this ability?
(Keep in mind that an argument can be made that the Spirit Ability Shapeshift: Spirit has a Spirit Point cost of 0 as the penalty for failing to end properly the Shapeshift: Spirit effect means, essentially, the Shapeshifter becomes for 1 day an NPC that behaves in fashion appropriate to the assumed form—which is, potentially, crossing-the-streams level of bad. I currently find that a weak argument, but if a convincing case can be made, that's cool.)
Note: Overuse of Initial Capitalization can be Blamed on AEG.