Aspect of Night and Day

As Aspect of Night and Day enters the battlefield, it becomes a 4/2 with flying and lifelink if {w} was spent to cast it.
It becomes a 2/4 with flying and deathtouch
if {b} was spent to cast it.
It becomes a 3/3 with flying, lifelink and deathtouch. If {w}{b} was spent.