Talk:Future Dragon, Drum the Neo/@comment-29523203-20160807233527

Hi community, i have a second question (idk if anybody gets to see my first regarding that new Katana World Impact Monster), anway it's rather simple but i want to play this card correctly:

does the effect of any dragonarms put into its soul activate already during that attack during which drum uses his ability to get such an dragonarms into its soul? or does the dragonarms only activate its "when a monster with this in it soul attacks" blahblah effect in my next turn or more concrete during my next attack phase when that dragonarms is already in the soul like normal soul card?? please help, thank you