What you need are cards like Wall of Omens, little Jace, Snapcaster, Stoneforge Mystic, Mother of Runes, Dragonmaster Outcast and Selfless Spirit
Still, Storm needs to deal combat damage to a player to activate its ability, but this can be done with other cards, like the Rogue's Passage land or the Aqueous Form aura enchantment
While we've played Cats a few times in the past and there have been Elemental tribal decks in both Modern and Standard at various points over the past year, in reality, all of the Kaheera tribes are somewhere between third-tier and unplayable
Unlike Cavern of Souls, Delighted Halfling can be tapped for any mana to cast any legendary artifact, legendary enchantment, and even legendary sorcery spell like Karn's Temporal Sundering
but in a way, it might be the most problematic, as its basically going to be a problem in any format you stick it in (even if people might not realize it)
This deck is begging to be tinkered with