Board Thread:Questions and Answers/@comment-28227210-20160421010144/@comment-26290163-20160421041316

Yes, you certainly may. If a situation happens that triggers an Automatic Ability, you can cast. That can happen at the beginning of any phase and ending. The only exception is the end of the start phase, but that is only because, as of yet, a card does not exist for that timing. While those places are Play Timings, many times, Bushiroad refers to them as "processing beginning of phase/turn effects..., processing end of phase/turn effects... These are for Automatic Abilities which the detailed rules show how to process, and the timing loops until both the Turn and Non-Turn Player are done processing their Automatic Effectd. Also, at the end of the Final Phase,(End of Turn), there is an exception, and the timing loops back to "At the End of~" and Automatic Abilities are processed there as well.

Also, during a normal Play Timing as seen in the detailed rules for the Attack and Final Phase (although there is also 1 in the Main Phase and 3 in the Start Phase) any player may cast an Impact or Spell or use an ability as long as either the conditional text is met, or it has the keyword [Counter] on the card and it fits the situation.

Main Phase options are different, and covered pretty well in the detailed rules. Lastly, the Battle Play Timing in the Attack and Final Phase limits the Turn and Non-Turn Player to 1 [Counter] each.

There's a lot more, but that covers the basics.

Here's a link to the latest Detailed Rules.

http://fc-buddyfight.com/en/wp/wp-content/uploads/【Detailed-Rules】Buddyfight_ver.2.01_20160418.pdf