Dog Umbra

Umbra armor was always a one-sided contract: gift a creature you control a free save from destruction, spending the Aura to do it. This one reverses the terms depending on whose creature it lands on. Enchant your own attacker and it reads like the totem armor Auras before it, a destruction shield that trades itself to keep the body alive. Enchant an opponent's creature and the umbra armor clause switches off (that clause is conditional on you being the controller), leaving a Pacifism that stops the creature from attacking or blocking but grants no protection at all. That conditional flip is the whole design: one card that is a protective aura or a lockdown depending on the target, and it flips based purely on control, so a creature that changes hands changes function mid-game. Flash is what makes the disabling half genuinely playable as removal-adjacent tech. You can hold it up and shut down a would-be attacker before combat, landing it in response to whatever threat demands an answer, rather than committing on your own main phase to blank a combat step in advance. It is a compact expression of an old idea (the two-mode Aura whose function turns on control) built atop a keyword that players almost only ever saw pointed at their own creatures, now weaponized to point the other way.