Talk:Black Demon Swordsman, Jace Aldis/@comment-24271522-20140909125754/@comment-2234004-20140909133423

It's ACT, it obviously doesn't have Counter.

You can only activate a skill outside of main phase in 3 cases:

1) It has Counter

2) The skill directly states you can use it during your opponent's turn

3) The activation timing is during a specific scenario (like receiving damage or declaring an attack)

If it has at least one of these, you can use it outside of main phase (though naturally, you may be limited to a specific situation depending on what the skill says).