I dislike the "add timer". Even why, if the counter is 3 or less, tha card can be useless, and if its like 5 or more, its more than enough time to finish a game in many situations. Nothing is more boring than see the opponent shield counter slowly decrease, and so he just play another shield when it comes to 0. So I would hate this timer change.
Immaterial is not also an option, it would be very very OP.
The point is, the protection is situational, but the 4 healing thing is already good enough to it becomes usable in most decks. No problem about you get a great benefit, if, lets say, you deck is foccused on defeat a certain deck type. Its like use Purify vs a Poison deck. The problem is, when a card is so foccused, it is not played, unless you know what you are going to play against. So, its ok if a card like that get a small benefit, even vs other decks, like Purify got that 2 healing. So, how about 2 healing? If the healing is 0, and we are going to get a super foccused card, it can even be immaterial. But the way it is now, it is an "almost shard" vs every deck and a strong counter vs cards like Black Hole and Discord. I voted to decrease healing option.
On a side note, I also think its wrong give so many healing cards to Light. Light now has Holy Light, Luciferin, Miracle, and this, not counting Angel, that can heal creatures and the Nymph. Life has Heal, Staff and Bonds. I feel there is something wrong. And in fact, I feel this card matches Life theme too. Maybe it could be our first "duo" card, with a
cost (in the bazar our your deck, could be listed in both elements).