Behind the smoke screen

Put the target creature in your hand on the battlefield face down as a 1/1 indestructible creature with hexproof as well. You may flip the creature up at any time in the game for {0}.
When the creature is flipped up, its effects activate(effects that say, "when you cast this spell," or, "when this spell enters the battle field," still activate.


What lies behind the unknown? Only time w-w-w...