Multiplier Cards

These cards are identical to territory cards in that they are colored (red, green or blue); however, each has an "x" followed by an integer.
For example, this card might come up:
x2
This card in effect would double the number of armies you receive from turning in a triple-blue (base 8 armies x 2 = 16) or mixed (base 10 x 2 = 20) set which includes x2.
Maybe they could go as high as x5?!?!?! Or should we limit it to x2?
For example, this card might come up:
x2
This card in effect would double the number of armies you receive from turning in a triple-blue (base 8 armies x 2 = 16) or mixed (base 10 x 2 = 20) set which includes x2.
Maybe they could go as high as x5?!?!?! Or should we limit it to x2?
