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Casting it to save Tifa is fine, and on your turn, you can kick it to help present lethal

It gets the various Sliver abilities of its tribe

This was done to try and create drama, although in retrospect, if we'd done it from the hand, it might have added drama to all Auras

Unlike Aristocrats, which are built around sacrificing low-cost creatures, Sacrifice decks are built around sacrificing all kinds of permanents, including forcing your opponents to sacrifice as well

They are 100% optional and can be completely ignored if you don't want to use them, and we won't be covering them in this series

It at least makes sure you keep bodies on board, assuming your graveyard stays stocked and you're not playing too much recursion