For example, if you cast Herigast for its emerge cost and sacrifice a creature whose mana value is 3, Herigast's mana value remains 9
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So, it can act as a backup if your commander is taken out too many times and you are having difficulty casting him
For descended , it doesn't matter if the card is still in the graveyard all that descended cares about is that, at some point during the turn, the permanent card(s) went to the graveyard
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They often generate Saproling tokens or benefit from spore counters, allowing them to steadily build up an army or ability over time