Enchantment
When ~this~ enters the battlefield, you may pay BB. If you do, you may search your library for a creature card, reveal it, and put it into your hand. If you do, you shuffle that library afterwards.
BB, Sacrifice a nonblack creature: ~this~ is black (This effect doesn't end)

Converted mana cost: 3

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AlexChurchill/TypeFourEnchantmentGenerator