The CR90 lets you spend an energy token to add an extra dice to the ships main weapon,

is this stackable?

For example (extreme example) could I add 5 energy to add 5 attack dice as the card doesn't say a maximum of 1?

this would be a general question for all cards that read similar (if there are any(currently or in the future))

Cheers

No.

No.

More specifically, it's the "one opportunity, one activation" principle. The "when attacking" language on the CR90 happens just once per round, so you have just one chance per round to spend 1 energy to bump your attack value.

(It's the same principle that keeps you from turning all of Luke's [eye] results on defense into [evade] results.)

Cheers, Looks like we were playing the 'Deathstar' variant!