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Say I have a Jam Signals set and my opponent plays a Leap Into Battle. Does my opponent declare who would get the +3 Attack from Leap before I decide whether to reveal Jam Signals, or do I have to decide on revealing Jam Signals first?

If your opponent jumps ahead and says "I'm going to play Leap onto Prowl" while you have a Jam Signals set, you can react to it and flip Jam Signals.
Source: Aequitas (2023-07-05)    【Link to Ruling】
Tags: Infiltrate, Jam Signals, Overrule, Lost In Transit, Unfathomable Motives