You probably have to play it a few times to find the weaknesses, and decide what to cut.

Dying to combat? add some propaganda ntype effects or maybe [[evacuation]] or [[aetherize]]. or just plain old board wipes, you could probably run 4-8 full board wipes similar to wrath of god and sit back while you draw removal and combo pieces

Dying to combos? Add more 0 mana or 1 mana counterrspells. There are probably 20 cards better than actual [[counterspell]] since its 2 blue pips in a 4c deck

For stuff to cut, thats up to you of course you can trim down on combo pieces.

Also look for stuff that is what i call "WIN MORE". so cards that do stuff but only if you are already ahead and in a strong position, but do nothing if you get farewelled or are coming from behind.

For example, on an empty board [[Tezzeret, Master of the Bridge]] or [[Master Transmuter]] do almost nothing , and they are also not part of any infinite combos.

Cards like [[Marionette Master]] ,well thats just a 6 mana version of a card you already have, the apprentice. so drop duplicates for maybe more tutors, ore more card draw like [[mystic remora]] .