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
Furthermore, Hexproof doesn't apply to a card while it's on The Stack
With The Sibsig Ceremony online, you can cast, say, a Chaos Defiler for , sac it, and get a 2/2 zombie plus two triggers
Valgavoth, Terror Eater Cruel and vast, the demon Valgavoth has an insatiable appetite for fear
This is strong start for the Broom deck and one that should be fairly consistent
For the time being, however, Yawgmoth seems to be truly bested, as he isnt seeing much play anywhere