Re: i need some more help.

well that could simply be a mepidian ability that requires the use of a mugic counter, not an actual mugic itself.

For the question on Mugic, I doubt you can use mugic from creatues not currently engaged. Or else it would be very cheap and unfair (ie: your facing a maxxor and you simply throw out 6 mugics on the first turn to cripple him)

In the show their never shown using mugic from another creature, but they are shown using abilities from other creatues during battle.