John Silver, Pirate Recruiter

At the beginning of combat on your turn, create
a 2/2 black pirate creature token with menace
that's tapped and attacking. At the beginning of
your next end step, sacrifice it unless you
sacrifice a Treasure.
Whenever an opponent is dealt combat damage,
they mill 4 cards. For each artifact or legendary
card among those cards, you create a Treasure
token.