Bellowing Fiend

A symmetrical-damage flyer built on the kind of self-punishing logic Tempest liked to flirt with: every time it bites a creature, it lashes both controllers for 3, the opponent and yourself alike. The damage trigger fires on creatures specifically, not players, so this is an evasive blocker-deterrent and combat enforcer rather than a finisher; swing in, connect with a blocker, and you cash a 3/3 trade for a 3-damage hit that lands on you as hard as it does on them. The design discipline is that mutual cost: the card hands you reach and a defensive flying body but refuses to let the reach be free, which keeps a five-mana 3/3 from being a clean engine. That symmetry is also the catch that has kept it a curiosity rather than a staple. You have to want both halves of the trigger, and the situations where dealing 3 to yourself is acceptable (a clock you are winning, an opponent already low) are narrower than the situations where you simply want a flyer to deal combat damage. It rewards a build that treats its own life total as a resource to spend rather than a number to protect, which is a constraint most decks would rather not adopt.