Belos, witch hunter

At the beginning of your end step you may choose another target creature that hasn't been chosen if you do, chose a color. it becomes the chosen color and loses all other colors. that card can no longer have any other colors. if the chosen color is blue that creature gains flying. if the color is red it gains first strike. if the color is black it gains menace. if the color is white it gains vigilance. if the color is green it gains trample. the chosen creature loses all named abilities besides ones gaine