Cut to 30 cards. Smaller decks are much more consistant.
Remove all 6 Sparks. They only do 3 damage per play in your deck, more Immortals would be better if you want extra damage.
Remove both Daggers. Only 2 damage is not enough, switch to 1 Longsword (or 1 Lobotomizer if you have it).
Cut down to about 14 Aether Pillars, which will be plenty in a 30 card deck.
So it'd look something like this:
1 Longsword
14 Aether Pillar
5 Immortal
2 Lightning
2 Parallel Universe
6 Phase Dragon
Of course you could also try using Dimensional Shield instead of Immortals for some defense, but that's up to you.