Why is one a spell and one a permanent... that doesn't make sence to me...
And why would I ever use this card over a quintessence? it definitely needs a little less cost.
(And since Zanz already made clear that a graveyard for died cards won't be implemented in the game, you have to change the card effect a little so that the card stays in game more or less. For example, it can get stuck in a time bubble for one turn (Same effect as turtle shield) And becomes immortal till the beginning of the next turn...)