Cellestial Colonnade rulings magic

[Ninja]

I was looking at text of this card from new worldwake set:

Celestial Colonnade
Land (R)
Celestial Colonnade enters the battlefield tapped.
T: Add W or U to your mana pool.
3WU: Until end of turn, Celestial Colonnade becomes a 4/4 white and blue Elemental creature with flying and vigilance. It's still a land.

lets say I pay 3WU so its now a creature

ok so now i can play Holy Strength on it:

Holy Strength W
Enchantment — Aura
Enchant creature
Enchanted creature gets +1/+2.

But now when turn ends celestial colonade is no longer a creature? What happens to enchant creature?

[Arix]

The line "enchant ___" on Auras tell you what that Aura can enchant. If at any time the thing it's enchanting doesn't fit that criteria, the Aura goes to its owner's graveyard as a state-based action.

So when the Colonnade becomes a non-creature at the end of the turn, the game sees an Aura enchanting an illegal permanent and sends it to your graveyard.

[Ninja]

but I read in another post that if enchantment enchants creature and creature gets shroud then enchantment stays even though its illegal now, why is this different here?

[Arix]

Because that's not illegal. Shroud only stops a permanent from being targeted by spells or abilities. Auras only target when they're played - once they're in play and enchanting whatever it is they are, they no longer target it.