Using Deceiver Exarch to tap a creature?

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Deceiver Exarch allows me to tap a permanent my opponent controls.  So, I should be able to cast him when my opponent attacks, thereby tapping a creature before it attacks.  Why can't I seem to be able to do that in the online game?  Am I missing something?

Thanks.
Deceiver Exarch allows me to tap a permanent my opponent controls.  So, I should be able to cast him when my opponent attacks, thereby tapping a creature before it attacks.  Why can't I seem to be able to do that in the online game?  Am I missing something?

Thanks.

Your in-game stops might not be set correctly.  Check out where you have your auto-stops set.
You need a stop set on your opponent's beginning of combat step.  Declare attackers step is too late, since at that point they get to declare attackers first before anything else happens.