If you discard a card while you control Necrodominance, abilities that function when a card is discarded (such as madness) still work, even though that card never reaches your graveyard
The part that makes this a truly fearsome commander is that the slivers you cast while cascading also have cascade
However, by paying the cost listed in the top right of the left pane in the rules text, you're allowed to cast it as an Instant or Sorcery with the name listed on the card instead

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Collectors and players appreciate these features, making these cards valuable additions to any collection
The artwork depicts something resembling a dragon formed from the sea, flourishing its grand and imposing wings over the endless waters of the ocean