Each have their own strengths and weaknesses, and I think there's a decent argument for having any of them as your commander: Kitt Kanto, Mayhem Diva is the face commander of the precon and I think is the strongest of the bunch
Each one has the Aura and Role subtypes and the enchant creature ability
Luckily, this combo has far more stringent requirements for inclusion than Saheeli Rai/ Felidar Guardian
Of course, these abilities only benefit equipment decks, but in their element, you've got card advantage and mana speed, rare but appreciated effects for white
You need a critical mass of colored sources to cast everything so make sure that critical mass is stable
But to make that ability available for just two mana a tiny fraction of what might be available to a player at the time ensures that Time Walk can steal a match in completely unfair ways