This same dynamic can be seen throughout the year: Aetherdrift 's lack of identity leading to Tarkir: Dragonstorm being somewhat all over the place with half-baked mechanics
Going to six loyalty is somewhat of a protection ability in itself so you have several options when she lands as to keeping her in play and getting value from her
(2024-09-20) If your opponent discards a card while you control Leyline of the Void, abilities that check whether a card is discarded (such as Hollow One, or a madness ability of the discarded card) still work, even though that card never reaches that player's graveyard
On the other hand, Nightveil Specter can steal lands, which is a nice upside, but because it was printed nearly a decade ago, it doesn't fix our mana for the cards it steals (it's our only theft card that doesn't), so we either need to hope that our opponent is playing blue and black cards that we can cast with our mana base or hope that we can use Nightveil Specter to steal some lands of the proper color before moving on to casting nonland cards
One mana to get +3/+3 to your zombie team is incredibly efficient
