Okay, fairly specific situation, but there are a few times it may occur, and this happened with one player on 4 colonies and going for the win...
Player one attacks player two (player one going for win).
Player two, the Oracle, uses his power and forces player one to play his encounter card face up - player one uses a 10 as his attack.
Player two plays a kicker face-down, and plays his attack card.
Player one uses a wild flare (Calculator) that allows him to guess whether the combined attack values are odd or even - if he is right, player 2's attack card is reduced by the value of player 1's attack card; if he is wrong, player 1's attack card is reduced by the value of player 2's card.
Player one guesses odd.
Player two reveals a 7, with a x3 kicker. Player 1's guess was right.
Now the game bogs down into a rules scramble which cannot be resolved because the problem simply isn't addressed in the base rules, CI rules, or the FAQ.
In what order do the mathematics work here?
(7 - 10) and then x 3?
(7 x 3) and then -10?
Does the kicker permanently modify the attack card (in other words become part of it), and, if so, WHEN does it do so? The moment it is played? The moment it is turned face up?
Does it all happen at once, and so follow the general timing rules - offence effect (Calculator wild flare), then defence effect (kicker)? This would mean different results with the same mathematical operations depending on which player uses which card.