Have them in mind, as well as Titans Strength.  Sideboard is not finished r "real" yet.

Sure Strike is +4 power with prowess for 2 mana.  2 Defiant Strikes is the same, buffs toughness more and they replace themselves.  First Strike is less important with more toughness, and unimportant if making the creature unblockable.  Also many creatures in this deck have high toughness to start.

Temur Battle Rage also doesn't replace itself, which is the big theme here.  It's big as a finisher, but doesn't reliably win the game since none of my creatures have trample unless I chain it with one or two other spells to prowess up to 4 power our have both Zada and Ascendancy out.  Could still be big enough of a wincon with that combo to use though.

Titans Strength is 1 mana, which is a lot easier to leave up for opponents turn.  And has a secondary upside of the Scry, which appeals to me in combo with the cantrips.  Titan's Strength on Zada, 4-5 Scry effects, dig deep to find Slip Through Space, then cantrip or treasure cruise to draw it and cast (or Scry on opponents turn and win next).

No Sure Strike or Temur Battle Rage? I think you should at least sideboard some of those.