No this isnt called the World's greatest card trick, is was ment as a question, Is this the world's best card trick?
And there is a trick called WGCT, isnt it the one where you ask some one to chose a card, they look at it, put it back in the pack, *snaP*you spread the deck and one card changes colour and it's their card, you take that card out and place it to the side. You go on to repeat the trick with a different card, goes into the middle, *snap* but a card doesnt change colout, patter, patter, patter. Oh there is one different coloured card, that one over there, thats been there the whole time, yes it is.
Cheers, Tom
Ps. and the above trick you described is called out of this world.