Fractal now is... ALMOST balanced. i think it should cost 8 quanta unupped, 5 upped, though. For it to be effective, you still need at least 4-or-so slots free in your hand, PLUS the quanta. (Both Aether and the quanta for the Fractaled card)
CARDS:
OP: Crusader, obviously. Not only it has a great starting attack, but having a momentum'd/sniper Crusader makes them extremely strong. not counting poison, and others. (Light + Fire anybody?) As if Flying Weapon was already useful enough.
UP: Silence. For it to be useful there are only two cases: you can survive one more tunr before winning, but not if the opponent plays any damage creature. OR at the start of the game for most decks, when the opponent will have an almost-full hand, causing him to discard one card. in 30 or more.
least use: Silence, for the above reasons.
more use: Sky Blitz, but that's due to most of my decks having airborne creatures (FFQ, Phoenix, etc.)