This looks like Dan Hauss' Gorilla Change. It has a small change that, if I have guessed right, doesn't change the method significantly. In order to get it accepted you need to show its strengths when contrasted with the other available methods out there. You can do this by showing a full developed performance, alternative handlings, ways to get into and get out of the trick. Pit your effect up against other color changes, really prove why it is better to only change a part of the card at a time.
Thank you for the comment and advices. It is really hard to check each method, each trick regarding similarity. It was my first trick idea, and there wasn't any influence by another tricks during creating this. In the future I will take care more about tricks history. Regarding the advantages of this trick, at the end the card can be taken out of my hand by the spectator, and I think changing only a little part of the card to another one can baffle the spectator more because in the reality there is no such a card.