Suppose I have Noyan Dar, Roil Shaper, and I cast an instant and use the trigger to put 3 counters on a Celestial Colonnade, turning it into a 3/3 colorless Elemental with haste.
Now suppose I activate Celestial Colonnade. What happens? My assumption is that it becomes a 7/7 white and blue Elemental with haste, vigilance and flying until end of turn, and then it goes back to being a colorless 3/3 with haste. Is this correct?