I like it too, but I'm going to restate what I said before.
I think it should be called Pacifism and cost 1
.
You (Essence) state that it can be used to 'protect one of your creatures from shield effects' - Gravity should use Momentum for this, since the creature not only gets to keep it's attack, but it's attack and defence are increased.
Maybe you could further the idea too, so that it
a) Lobotomizes the target creature aswell? Maybe OP, make it cost more
? Or maybe only Lobo if target is an enemy.
b) The attack power of the creature is multiplied by two, and then added to your health (as a primitive heal), then it is set to 0
My reason for a) is: Antimatter is a lot better than this card to control enemy creatures (as in, to keep them on the board but make them beneficial to yourself).
My reasoning for b) is, same as a), why not give it a little something more?