You are just wrong on so many levels here. The infinite combo with persist doesn't even work (not sure why you called it wither). Once the creature you gave persist to goes to the graveyard and comes back, it no longer has persist. Second, when you sac the thrull for black mana you don't mill them for the cards. You would have to sac it to the altar for that. Would help if you have basic understandings of the rules before posting.
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