Penumbra Umbra

If a creature enchanted with an Aura that has umbra armor would be destroyed by multiple state-based actions at the same time (most likely because a creature with deathtouch has dealt damage to that creature greater than or equal to its toughness), umbra armor’s effect will replace all of them and save the creature.

If the enchanted creature is no longer on the battlefield when Penumbra Umbra’s second ability resolves, use its copiable values as it last existed on the battlefield.

If the copied creature is a token, the new token that’s created copies the original characteristics of that token, with the exception noted above.

For many playtest cards, you’ll need to make a generous assumption that basic game rules would be updated to allow them to work. The Mystery Booster 2 Playtest Card Notes section (reproduced here in individual Gatherer rulings) provides guidance for fitting these cards into the existing rules structure.

If a creature you control is enchanted with multiple Auras that have umbra armor, and the enchanted creature would be destroyed, one of those Auras is destroyed instead—but only one of them. You choose which one because you control the enchanted creature.

Umbra armor has no effect if the enchanted creature is put into a graveyard for any other reason, such as if it’s sacrificed, if the “legend rule” applies to it, or if its toughness is 0 or less.