There have been some light Vortex wannabes like Klothys, God of Destiny and Roiling Vortex, and those cards see play in EDH decks that want to regularly damage their foes
Additionally, if paired with a sacrifice outlet, Karador can allow you to get the most out of the most impactful death triggers in the game each turn, potentially accumulating substantial value
This is strong start for the Broom deck and one that should be fairly consistent
Furthermore, Hexproof doesn't apply to a card while it's on The Stack
To determine a spell's total cost, start with the mana cost (or an alternative cost if another card's effect allows you to pay one instead), add any cost increases (such as kicker), then apply any cost reductions
Precon decks often have overpowered commanders to smooth over the jank often found in the 99 and this precon is no exception: Cloud, Ex-SOLDIER is incredible leading the stock list, immediately getting tremendous value the moment you cast him, providing card + mana advantage while beating face
