Thursday Morning Riddle

I’m a magical feat caused by legerdemain;
I am dirty when found in a vicious campaign;
I’m the cards in a round that you try to obtain;
And the threat that some Halloween greetings contain.

Who am I?

UPDATE: Riddle solved by Justin. See comments for answer.

3 Responses to “Thursday Morning Riddle”

  1. Justin Says:

    Trick

  2. Brian Says:

    Man, this one was tricky. Get it? Get it?? Anyway…

  3. Bill Says:

    It’s not a trick, Brian, it’s an illusion.

    TRICK is correct. Welcome, Justin!

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