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For example, sacrificing multi-typed creatures like Spirited Companion helps to fuel delirium for cards like Demolisher Spawn and Fear of Missing Out, or fills the graveyard for threshold threats like Kiora, the Rising Tide

Another Floodborn card, Ursulas Shift ability reduces her Ink cost from 7 to 5, which is pretty handy if you have another Ursula in play already

Enchant creature When this Aura enters, untap each creature you control

Graveyard recursion Black treats the graveyard like a resource

Who won the most

Nefashu passing out -2/-2 to five creatures, -1/-1 to ten, or somewhere in between would wipe parts of the battlefield nicely