When is the cost of an attachment paid, before, after, or during entering play?
When Attachment cost is paid
A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
When is the cost of an attachment paid, before, after, or during entering play?
http://rules.l5r.com/Card_types#Using_attachments
To play an attachment card, a player follows this sequence:
A. The attachment enters a specially created entering-play area.
B. If the Personality being attached to has not already been designated, the player chooses a legal Personality for the attachment. The attachment's restrictions on entering play are then checked. If it can not enter play (including not having a suitable Personality), the attachment returns where it came from.
C. If restrictions are met, the player pays the attachment's Gold cost. If the cost can't be paid, the attachment returns where it came from.
D. If restrictions and costs are met, the attachment enters play.
E. The entering-play area ceases to exist.