Hazoret's Undying Fury
Six mana to gamble on the top of a freshly shuffled library, then pay for it by skipping a turn's worth of untapping. The shuffle is the wrinkle that separates this from the older school of free-cast cascade and ritual-into-payoff effects: you do not get to stack the four exiled cards, you get whatever the randomized top of the deck hands you, and the mana value 5 ceiling caps how big the swing can be. That combination of unknowable yield and a self-imposed tempo tax (lands locked down through the next untap step) makes the card a study in deliberate variance. The reward scales with how dense your deck is in castable five-drops-and-down; the punishment lands regardless of whether the gamble pays. It sits in the red lineage that trades reliability for explosive upside, wanting a deck constructed entirely around hitting and converting its hits rather than one that splashes it for value. The land-lock clause is what keeps the effect from being pure profit: even a perfect flip of four free spells costs you the following turn, so the payoff has to close the game or build enough board presence to survive the dead step. A six-mana sorcery that asks you to bet your whole next turn on the shuffle is not a card for the cautious; it presumes the deck has already decided it would rather win now than untap later.
