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.
Yoritomo Ascends reads Kami • Thunder If you control 20 or more Samurai, remove the 20 of them with the highest Force from the game. You do not need them, for you are your twenty strongest! If this removed 20 Samurai, you win the game
My question is: Is this a One time chance when it resolves and you must do this or miss your chance; or does this event stay in play like Claiming the Throne?
Is this a One time chance when it resolves and you must do this or miss your chance(?)
Exactly that.