Luke Cage, Power Man

The trigger does something quietly subversive with the solo-attacker restriction: it turns a losing line into a threatening one. Sending a single creature into open mana is normally how you hand it to a removal spell, but a 2/5 that swings for four and gains indestructible while it does so is an awkward body to answer on that specific axis. The toughness carries as much of the design as the trigger does. At 2/5 he survives most combat math and most burn before Unbreakable Skin ever fires, and once it does, the indestructible clause shuts off every effect that reads "destroy" for the rest of your turn: no targeted destroy-based removal, no combat trick that trades up, no block that kills him. What the indestructible clause does not do is worth stating plainly, because the reward is narrow. It grants nothing on the opponent's turn, so a sorcery-speed board wipe cast on their main phase catches him like anything else, and it offers no protection against sacrifice effects, exile, or bounce, which route around destruction entirely. The answers that remain are the same ones white has always struggled to interact with. The discipline is that all of this is conditional on attacking alone, pricing the resilience against tempo: you get the durable beater only on the turns you commit to a lean, one-threat clock rather than a wide assault, which asks for a deck built to protect the rest of its plan somewhere other than the red zone.