Slippery Scoundrel 

Creature — Human Pirate
Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.)
As long as you have the city's blessing, this creature has hexproof and can't be blocked.
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Cards that do something similar expected a card that isn't here?
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Stoic Sphinx 82%
$0.17#21153
"This creature has hexproof as long as you haven't cast a spell this turn."