God i wrote such a long post and misclicked and lost it.
Long story short:
Mom is better than shikari/greaves. Cost 1 instead of 4, gives ground control via unblockability and unkillability via combat damage. Also occupy 4 spots instead of 8. Way superior.
White has one of the best card for anti-storm combo:
Ethersworn Canonist. If you fear combo so much, run 3 in the main +1 sb or a similar split. I'd remove batterskull (too slow in a pure aggro deck with no way to cheat on mana) , 1 Avenger (drawing 2 early without vial is annoying) and the puresteel paladin altogether, they make you play a bad mana base (relevant against merfolk, goblin) and they don't draw more than 1 card a game on average.
Card that could be considered: Oblivion Ring (if i'm not mistaken you can remove one permanent forever + another permanent when it re-enter into play via vialing Flickerwisp in response to Enter into play trigger), Mirran Crusader, Weathered wayfarer, leonin ward-reliquary or whatever it's called.