2015-02-25 : After Dance of the Skywise resolves, the creature can gain abilities as normal.

2015-02-25 : Dance of the Skywise overrides all previous effects that set the creature’s power or toughness to specific values. However, effects that set its power or toughness to specific values that start to apply after Dance of the Skywise resolves will override this effect.

2015-02-25 : Effects that modify the power or toughness of the creature, such as the effects of Giant Growth or Hall of Triumph, will apply to it no matter when they started to take effect. The same is true for counters that change the creature’s power or toughness (such as +1/+1 counters) and effects that switch its power and toughness.

2015-02-25 : The target creature will lose all other colors and creature types and be blue, a Dragon, and an Illusion. It will retain any other types it may have had, such as artifact.

2015-02-25 : The target creature will lose any abilities it may have gained prior to Dance of the Skywise resolving. Notably, if the creature is a face-down creature with morph or megamorph, you can’t turn it face up, as it wouldn’t have a morph or megamorph cost when face up (because it’s lost all abilities other than flying).