Count Nefaria

A 6/6 flier priced at seven mana would be embarrassing top-end on its face, but this one carries a rebate that fires on a condition most black decks are already meeting by their main phase. The clause doesn't ask for a sacrifice outlet as part of the payment; it only checks whether a permanent has already died to sacrifice this turn, which turns any incidental fodder-eating into a discount that drops the cost to four. That decoupling is the interesting part. Cards that reward sacrifice usually build the cost into the effect: sacrifice a creature to do the thing. Here the sacrifice is a state you enter, not a resource the card consumes, so a board already committed to grinding permanents gets the fatty essentially for free. Token generators, treasure spending, fetchable value creatures, aristocrat engines: anything that has fed a sacrifice by the time you reach the point of casting pays the toll retroactively. The reduction floors out and stops there, so multiple sacrifices buy nothing extra and there's no runaway; one is all it needs. What's left is a payoff that rides on top of an existing plan rather than demanding its own, a flying threat that costs whatever your engine's exhaust happens to make it cost.