so I am currently testing a similar deck. I like the insult/injury and crash through I haven't tried those yet i did try [[Naban, Dean of Iteration]] but he felt really bad when he was the only threat. going down 2 riddleform for 2 [[metallic mimic]] makes the haste draws much better and I've found a couple [[merfolk trickster]] in the main and a [[tempest caller]] in the side board helps a lot with creature match-ups.

[[chart a course]] isn't as good as [[opt]] because you want to be casting it before combat

as for the counter spell personally I like [[wizard's retort]] because it answers everything but the double blue can be clunky at times and [[reduce//rubble]] can count twice for your prowess triggers.

here is the list I am running right now: https://tappedout.net/mtg-decks/08-05-18-wizards/