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
Focus on sacrifice, value, and reanimation
Don't Blink is a very effective anti-blink tool, counteracting flicker effects and even the occasional weirdly-worded recursion effect like Living Death
Or maybe youve cast a tapping Twiddle on it
I have played all of them and played against them, so I feel like I have logged in enough games that I can have some degree of qualifications when I discuss the best
Kinnan, Bonder Prodigy Speaking of mana doublers, Kinnan, Bonder Prodigy does it better than most