From the Comprehensive Rules 4.0:
A cost of an action could be adding or removing twilight tokens, exerting a character, discarding a card, or any number of other possibilities. The costs for an action are usually listed before the word “to” (so the action takes the form of “pay X to do Y,” with X being the cost and Y the effect).
If a card or special ability has a cost, you must pay that cost or you cannot use that card or special ability. (See exert, Shadow phase(s).)
You must meet any requirements to play a card (or perform an action) before paying its costs. (See spot.)
If a Free Peoples event requires you to spot twilight tokens, they must be there before you add tokens to pay for that card’s cost.
If you have two copies of Weapons of Isengard in play (“Shadow: Play an [Isengard] archer to place an [Isengard] token on this card.”), playing a single [Isengard] archer allows you to place a token on only one of those copies.
If an action is prevented, its effects are ignored but its costs and requirements are still paid.
If a player is paying costs for a card and a response action occurs which modifies those costs, that player must continue to pay as many costs as he can, even if it is no longer possible to pay them all. If all the costs cannot be paid, that card has no effect.
See also discard pile, draw deck, twilight cost.
|General||At Random||Can/Cannot||Cost||Effect||May||Limit||Pass||Prevent||Spot||Up To|
|Triggers||At the Start||Each Time||When||While|
|Phase Actions||Assign||Cancel||Special Ability||Response|
|Site Actions||At a Site||Control||Liberate||Replace|