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Theres a very specific combo that allows you to accrue tons of value by sacrificing Narfi over and over again

Primathmech Laplacian X EARTH Rank 4 [ CyberseXyzEffect ] ATK 2000 DEF 0 3 Level 4 monsters If a "Mathmech" card(s) you control would be destroyed by card effect, you can detach 1 material from this card instead

It exiles instead of destroys, and the siphoning of life is the cherry on top

There are certainly cards that work fine with both and it can be done but you will either have stuff that does nothing with one half of your engines or you will have a pretty underwhelming Sneak Attack compared to what it can do

2024-06-07 Umbra armor has no effect if the enchanted creature is put into a graveyard for any other reason, such as if it's sacrificed, if the "legend rule" applies to it, or if its toughness is 0 or less