[Misiur]

pawn Код:

//Somewhere high
forward ChangeColor();

//Before closing braket of OnGameModeInit
SetTimer("ChangeColor", 60000, true);

//Under OnGameModeInit
public ChangeColor() {
    static tick = 0;
    tick++;
    static colors[4][4] = {  "~W~", "~Y~", "~B~", "~R~"};
    static first[5] = "Text", second[5] = "Draw";
    new str[32];
    format(str, sizeof(str), "%s%s %s%s", colors[tick%2], first, colors[(tick%2)+2], second);
    TextDrawSetString(Text1, str);
    return 1;
}

It isn't very flexible, but works for your example