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
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
With The Sibsig Ceremony online, you can cast, say, a Chaos Defiler for , sac it, and get a 2/2 zombie plus two triggers
If you win the flip, create a Treasure token
This deck is an absolutely perfect combo of sacrifice, recursion, and power mechanics
For the time being, however, Yawgmoth seems to be truly bested, as he isnt seeing much play anywhere