Dramatic Accusation does not allow you to trigger the ability at instant speed.
The card Dramatic Accusation has an ability that should be able to be used at instant speed, hover in 3 separate games I have not been able to activate it's ability in response to triggers sacrificing the card that was enchanted. Mana is open, but the ability to interact in response is not there.
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Rezzahan#77802 commented
Could you give an example of a card that this happened with?
If you are refering to activated abilities with a sacrifice in the cost, then of course you cannot respond with the shuffle. The object is sacrificed before you get priority to do so, since it is a cost and happens upon activation.
If it is a triggered ability, the sacrifice may be an optional one. In which case, you won't know if the player wants to use that option until he chooses to do so on resolution. At which point it is too late to respond as the trigger is in the middle of resolving.