Billowveil Silkmercer

Ward—Mill 10 cards. (Whenever this creature
becomes the target of a spell or ability an opponent
controls, counter it unless that player puts the top 10
cards of their library into their graveyard.)
Whenever a spell or ability that targets Billowveil
Silkmercer resolves, sacrifice it.
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But a humble peddling illusionist turned miller's son.