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If enough -1/-1 counters are put on Hei Bai at the same time to make his toughness 0 or less, his last ability will see all of the +1/+1 counters he had when he left the battlefield as well as the -1/-1 counters he had, and an equal number of each of those types of counters (plus any other applicable counters) will be put onto the target creature

As such Mystic Confluence is generally on par with the cube power level of cost to return (assuming you don't have to repeatedly Mana Leak the same target)

Her negative loyalty ability puts the top two cards of the controller's library into their graveyard, and then returns a creature card from their graveyard to their hand

It plays perfectly into artifact-friendly shells, which is a lot of these shells