There is a question on rules conflict from the Comprehensive rules and a ruling by a member of the Rules team here on the forums.
Page 55 of the Ivory Edition Comprehensive Rules states, ""Before paying for a card entering play, a player may permanently increase the card’s Gold Cost by the additional cost in its Invest trait, once, to get an additional effect after it enters play."
You have a card such as Your True Nature, which states, "Destroy a target attachment with Gold Cost less than or equal to the amount paid, or the amount paid plus three if the target is an Item."
Then you have a ruling from March 2014, Subject: Unsettling Gathering vs. Clay Kshatriya
Ben Higgins wrote:Invest does not change the Gold Cost of a card. When paying for a card entering play, you may pay additional Gold for the card equal to the additional cost in its Invest trait, once, to get an additional effect after it enters play (for example, “Gain 1 Honor” or “Give this card a +2F token.”) This does not increase the Gold Cost stat of the card, but is treated as other effects that increase required payments by using "paying" language.
For the purposes of Unsettling Gathering, an Invested Clay Kshatriya would only require 2 Gold to transfer.
EDIT: For clarification. -Ryushi
Could I get clarification on this please?