Tephraderm

Reflection damage is the design here, split across two clauses that route the same number to two different places. The combat trigger is the older idea: anything that swings into this beast or blocks it takes the same damage straight back, so smaller attackers and blockers self-immolate against the bigger frame. The second clause is the one worth studying. When a spell deals damage to it, the rebound goes not to the spell and not to a permanent but to the spell's controller. Point a three-damage burn spell at it and you take three to the face, regardless of whether the 4/5 survives the hit: the triggered ability is already on the stack, and it resolves even if state-based actions kill Tephraderm first. The toughness still matters, since a body that lives keeps presenting the threat, but the deterrent does not depend on it. The design problem it answers is how to tax point-and-shoot damage, and it answers that and little else. Destruction, exile, -X/-X, and bounce all ignore both triggers and deal with it clean. What it punishes is one specific reflex: reaching for burn or a fight effect to clear a midrange threat. Against an opponent leaning on damage-based removal, it forces a choice between paying life to push the spell through or finding an answer that never deals damage at all. Outside that lane, it is a 4/5 carrying two triggers that most decks can simply route around.