Havoc Demon

The threat here is not the flier; it is what happens when the flier stops being one. A death trigger that hands every creature on the board -5/-5 turns this into a board wipe you can attach to a sacrifice plan or simply trade away in combat: kill it, lose it, or let it die in a block, and every creature still standing evaporates the moment it hits the graveyard. The number is calibrated to the body, so a five-toughness clean sweep takes most of what a creature deck has assembled. But the symmetry runs the other way too, and that is the cost of admission: because the wipe fires from the graveyard, the Demon never benefits from its own toughness against it. It is already dead when the effect resolves. So you are paying seven mana for a beater whose best play is to die, and the trigger does not discriminate, so anything of yours sharing the table goes down alongside the enemy unless it is large enough to survive or recurs from the yard. The design lives in the gap between two readings: a flying threat that punishes blocking, and a delayed Damnation that the opponent triggers for you the moment they answer it. The aristocrats-style payoff (sacrifice it on your terms, time the wipe) reached toward where black's death-trigger creatures would later land, even if the rate kept it out of the conversation it was angling for.