PAUSE/FAST FORWARD(upgrade)
Costs way too much, is way too powerful. Maybe a way to balance it is to make it cost 5 Time Quanta and all the time quanta you have? A bit like Improved Miracle does at the moment. And instead of it making your opponent lose his turn, how about you gain an extra turn? Eg. You press spacebar, you attack, you get quanta, you heal then it is your turn again.
DEGRADE
Nah, rewind time already does this in a way but is just better. Also, instant kill cards are frowned upon, which is what this is. Secondly, there is not a way (that I know of) of returning the quanta cost of a creature to your opponent once it is in play.
PALISADE
Earth already has Titanium and Diamond shields which reduce damage by 2 and 3 respectively. This means that any creature which does 3 or less damage is completely ignored. And any creature which does over that amount will also do a lot less. This shield simply halves incoming damage? Not really useful. There are plenty of shields already which completely block incoming damage. I cannot see a scenario where I would want to put this in my deck.
FIELD SHRINK
Hmm, the only interesting card I see here, maybe thats why you left it for last? If it was to be a permanent, and not a spell then yes, it could work. What would happen if you played it when your opponent already had more than 7 creatures in play?