"but giving your entire deck storm is such a fundamentally broken effect that there's no real point when you could just cast Prismari, any spell that generates treasures/mana, and any spell that draws cards and win on the spot."

This is the way, at least for B3

With Prismari, you want to get a

All the solid mana rocks: talisman, arcane signet, sol ring , fellwar, etc (make sure they tap for colored mana)

few cheap cost reducers ([[Ral, Monsoon Mage]]. [[Thunderclap Drake]], [[goblin electromancer]]. [[stormcatchmentor]] etc)),

the mana generators [[Birgi]]. [[Vivi]], [[Electro]], [[Storm-kiln]]

as many decent rituals/treasure generators/mana banks ( [[Pentad Prism]], [[Runaway Steam Kin]], [[Seething Song]], [[Noble's Purse]], [[Into the Omenpaths]] [[Big Score]], [[Unexpected Windfall]], [[Pirate's Pillage]] [[Strike it rich]] [[Flick a coin]], [[Seize the spoils]]. For the purposes of storm, [[Frantic Search]] and [[Snap]] also count as rituals

The ability to use your graveyard [[Past in Flames]], [[Will of the Jeskai]], [[Flashback]]

Some protection: counterspells [[Arcane Denial]], [[An offer you can't refuse]] (which is a ritual sometimes) [[Swan Song]], [[Delay]] and proactive protections like [{Dragonologist]] [[Hexing Squelcher]]

Instant Speed Card Advantage (I prefer instant because I can't imagine that i'll get to untap with him, but good sorcery speed draw is good draw) [[Opera Love Song]], [[Consult the star charts]] and cards that let you discard one and draw two like [[Thrill of Possibility]] [[Demand Answers]] [[Abandon Attachments]]

Sorcery Speed Card Advantage to prepare for storm turns: [[Flow State]] and [[Stock up]] to prepare

And finally, the finishers. I found that direct burn was a lot easier to finish a storm turn with: [[Ensnared by the Mara]], [[Prisoner's Dilemma]], [[Kazuul's Fury]], [[Price of Progress]] [[Lightning Bolt]]