Honestly, I'd pick a focus before you do anything else. What do you want to accomplish?
Your deck is so thinly spread that I can't really see any theme.
I'd choose your basic idea: speed, power, control, whatever; and choose your cards from there.
As a totally off-hand idea, here's a 32-card rainbow power deck using a couple of your cards:
Mark of Life
8x Quantum Pillar
6x Nova
2x Werewolf
2x Plague
2x Graviton Fire Eater
2x Graboid
2x Emerald Dragon
2x Pegasus
2x Lightning
2x Ice Shield
2x Electrum Hourglass