A battle happens from the point you declare you wish to attack, and thus any effect that prevents cards from being activated at the point of a battle starts cannot be activated, see the first example below for how to write that kind of effect
In Tempest, it was turn one (Mogg Fanatics, shadow creatures, and flyers), Invasion turn two (2/2 bears for every possible color combination plus several one- and two-mana apprentices and utility creatures), and Mirage turn three
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Machoke's ability to learn a variety of moves, such as Karate Chop, Submission, and Dynamic Punch, further enhances its utility in battles
Cross Duel " Ice Mirror " pages Anime Yu-Gi-Oh