What is more immediate, the Rule or the Action? In other words, does the playing of Inflation close the Box, so to speak; or does it affect the Box, meaning you have to draw to a fourth rule?
A: It goes to 4. Since everything happens immediately in Fluxx, Inflation is applied to the Action that caused it to be played. So yes, you’d continue to a fourth rule if Inflation came up during Pandora’s Box.
Adventure Time Fluxx includes the Inflation analogue, Mathematical! Inflation is also available as a promo card to add to any Fluxx deck.
Math Fluxx includes a card called Increment All, which is similar to Inflation except it only affects Actions and New Rules.