If a creature with persist that has +1/+1 counters on it receives enough -1/-1 counters to cause it to be destroyed by lethal damage or put into its owner's graveyard for having 0 or less toughness, persist won't trigger and the card won't return to the battlefield
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As for the card, it's a copy of Akroma's Will, an instant that lets you choose between all your creatures gaining flying, vigilance, and double strike, or lifelink, indestructible, and protection from each color until the end of the turn
In a digital-only environment, there isnt the usual requirement of spelling out every single detail on the card itself, which WotC says will open up new design possibilities or even allowing it to modify Davriels lists substantially post-release
You dont even want Nosepass in there unless you're ready to go all in