Zyx and maw give tempo, but make for mediocre synergy with phantasm due to the 2 hp, something that a 2 mana 3 hp minion can give more threat to.
I only suggested removing 1 repulsor, as with aggro/tempo, you want to have removal, but only as a necessity; it that extra card slot can be used for something else, it is available.
I took back removing sojourner due to a fair synergy with phantasm. Again, the Zyx/maw and phanstasm/others doesn't blend as smooth as most opponents decks are in terms of being fine-tuned. This is the area where I'd consider giving your deck more direction.